Number 13 facts
The odd number 13 is spelled 🔊, and written in words: thirteen. The ordinal number 13rd is said 🔊 and written as: thirteenth. The meaning of the number 13 in Maths: Is it Prime? Factorization and prime factors tree. The square root and cube root of 13. What is 13 in computer science, numerology, codes and images, photo art, writing and naming in other languages. Other interesting facts, news related to 13. ‹‹ 12 14 ››
Interesting facts about the number 13
More photos ...Areas, mountains and surfaces
- The total area of Java is 53,589 square miles (138,794 square km). Country Indonesia (Banten, Jakarta, Yogyakarta and Central, East and West Java). 13th largest island in the world.
- The total area of United States Minor Outlying Islands is 2,687.04 square miles (6,959.41 km²) and the water area is 2,678 square miles (6,937 km²) and the land area is 13.2 square miles (34.2 km²).
Astrology
- It is one of the lucky numbers for the zodiac sign Scorpio.
- What is astrology and what is it for?
Astronomy and space
- (13) Egeria is asteroid number 13. Was discovered by A. de Gasparis from Obs. Astronómico de Capodimonte 11/2/1850.
- Apollo 13 was a NASA Moon mission famous for being a 'successful failure' in 1970.
Distances
- There is a 13 miles (20 km) direct distance between Abū Ghurayb (Iraq) and Baghdad (Iraq).
- There is a 13 miles (20 km) direct distance between Álvaro Obregón (Mexico) and Ciudad Nezahualcoyotl (Mexico).
- There is a 13 miles (20 km) direct distance between Delhi (India) and Ghāziābād (India).
- There is a 13 miles (20 km) direct distance between Depok (Indonesia) and Jakarta (Indonesia).
- More distances ...
Games
History and politics
- United Nations Security Council Resolution number 13, adopted 12 December 1946. Admission of Siam (Thailand). Resolution text.
In other fields
- Unreasoned fear of the number 13 is termed triskaidekaphobia
- On average a person laughs 13 times in a day.
- Symbol of Hate: The number 13 is a numerical symbol of the Aryan Circle, the great racist prison gang based in Texas. Substitute letters for numbers, 1 and 3 equals A and C, that is, AC or Aryan Circle. The list of evil numbers.
- Dreaming of the number 13 means transformation to the new, much higher and spiritual being.
Life and Society
- Mara Salvatrucha, commonly known as MS-13, is an international criminal gang that originated in Los Angeles, California, in the 1980s. Originally, the gang was set up to protect Salvadoran immigrants from other gangs in the Los Angeles area.
Literature
- The ISBN Group Identifier for books published in Spain
Mathematics
- 13 is the 3rd centered square number
Example of 4th centered square number with 25 dots. - 13 is the smallest prime which is not a minimal prime
- 13 is the smallest prime which can be represented as sum of two primes (i.e., 2 + 11) as well as sum of two composite numbers (i.e., 9 + 4)
- 13 is the number of times in one century when the date in the format month day and the last two digits of the year can be written with the same digit
- 13 is the number of intersections of diagonals inside a regular hexagon
- 13 is the number of Archimedean solids.
- More mathematics ...
Religions
- 13 were the diners of the Last Supper of Christ
- The apparitions of the Virgin of Fatima in 1917 were claimed to occur on the 13th of six consecutive months.
- In Judaism, 13 signifies the age when a boy matures and becomes a Bar Mitzvah, that is, a full member of the Jewish faith.
Science
- Aluminium is the chemical element in the periodic table that has the symbol Al and atomic number 13.
Sports
- Ángel Nieto Roldán was a Spanish motorcycling pilot, world speed champion 13 times.
- The best athletes to wear number 13
Wilt Chamberlain, NBA; Dan Marino, NFL; Alex Rodriguez, MLB; Steve Nash, NBA; James Harden, NBA
Superstitions
- For Spain and Latin America, Tuesday the 13th is bad luck. For France and English-speaking countries it is Friday the 13th.
- The number 13 in Japan is considered bad for a purely mathematical reason, since it is the sum of 9 and 4.
Tv, movies and cinematography
- Film: 13 Rue Madeleine (13 Rue Madeleine) Year: 1946 Length: 92 Director: Henry Hathaway Featuring: James Cagney; Annabella
- Film: 13 Tzameti (13 Tzameti) Year: 2005 Duration: 95 Director: Géla Babluani With: George Babluani; Pascal Bongard
- Apollo 13 is a 1995 American film that recounts the problems of the failed Apollo 13 lunar mission. The film is a free adaptation of the novel Lost Moon, written by Jim Lovell (the Apollo 13 mission commander) and Jeffrey Kluger.
Please write us
If you know something interesting about the number 13 or any natural number (positive integer), please write to us.What is 13 in other units
| The number 13 converted to a Mayan number is |
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| Decimal and Mayan number conversions. |
Weight conversion
13 kilograms (kg) = 28.7 pounds (lbs)
13 pounds (lbs) = 5.9 kilograms (kg)
Length conversion
13 kilometers (km) equals to 8.078 miles (mi).
13 miles (mi) equals to 20.921 kilometers (km).
13 meters (m) equals to 20.921 feet (ft).
13 feet (ft) equals 3.962 meters (m).
13 centimeters (cm) equals to 5.1 inches (in).
13 inches (in) equals to 33.0 centimeters (cm).
Temperature conversion
13° Fahrenheit (°F) equals to -10.6° Celsius (°C)
13° Celsius (°C) equals to 55.4° Fahrenheit (°F)
Power conversion
13 Horsepower (hp) equals to 9.56 kilowatts (kW)
13 kilowatts (kW) equals to 17.68 horsepower (hp)
Codes and images of the number 13
Number 13 morse code: .---- ...--Sign language for number 13:
Number 13 in braille:
| Images of the number | |
| Image (1) of the number | Image (2) of the number |
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| More images, other sizes, codes and colors ... | |
Number 13 infographic
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Year 13 AD
- Tiberius made his triumphant procession through Rome after siege of Germany.
- The year 13 AD was the last year of shijianguo era of the Chinese Xin Dynasty.
Gregorian, Hebrew, Islamic, Persian and Buddhist Year (Calendar)
Gregorian year 13 is Buddhist year 556.Buddhist year 13 is Gregorian year 530 a. C.
Gregorian year 13 is Islamic year -628 or -627.
Islamic year 13 is Gregorian year 634 or 635.
Gregorian year 13 is Persian year -610 or -609.
Persian year 13 is Gregorian 634 or 635.
Gregorian year 13 is Hebrew year 3773 or 3774.
Hebrew year 13 is Gregorian year 3747 a. C.
The Buddhist calendar is used in Sri Lanka, Cambodia, Laos, Thailand, and Burma. The Persian calendar is the official calendar in Iran and Afghanistan.
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Advanced math operations
Is Prime?
The number 13 is a prime number. The closest prime numbers are 11, 17.
The 13rd prime number in order is 41.
Factorization and factors (dividers)
The prime factors of 13
Prime numbers have no prime factors smaller than themselves.
The factors of 13 are 1, 13.
Total factors 2.
Sum of factors 14 (1).
Prime factor tree
13 is a prime number.
Powers
The second power of 132 is 169.
The third power of 133 is 2.197.
Roots
The square root √13 is 3,605551.
The cube root of 3√13 is 2,351335.
Logarithms
The natural logarithm of No. ln 13 = loge 13 = 2,564949.
The logarithm to base 10 of No. log10 13 = 1,113943.
The Napierian logarithm of No. log1/e 13 = -2,564949.
Trigonometric functions
The cosine of 13 is 0,907447.The sine of 13 is 0,420167.
The tangent of 13 is 0,463021.
Number 13 in Computer Science
| Code type | Code value |
|---|---|
| Port 13/TCP, UDP | DAYTIME protocol |
| Unix time | Unix time 13 is equal to Thursday Jan. 1, 1970, 12:13 a.m. GMT |
| IPv4, IPv6 | Number 13 internet address in dotted format v4 0.0.0.13, v6 ::d |
| 13 Decimal | = 1101 Binary |
| 13 Decimal | = 111 Ternary |
| 13 Decimal | = 15 Octal |
| 13 Decimal | = D Hexadecimal (0xd hex) |
| 13 BASE64 | MTM= |
| 13 MD5 | c51ce410c124a10e0db5e4b97fc2af39 |
| 13 SHA1 | bd307a3ec329e10a2cff8fb87480823da114f8f4 |
| 13 SHA224 | 86730f0dd6381286d3b5f0dfb897ce4895480ce97564c6be4f1543b8 |
| 13 SHA256 | 3fdba35f04dc8c462986c992bcf875546257113072a909c162f7e470e581e278 |
| 13 SHA384 | 6356fbb43627033e886785c2a9c16980336df008b720d23f98b35e06ee69246287739c9d7458b39356c3bdb1e4e2c7fc |
| More SHA codes related to the number 13 ... | |
If you know something interesting about the 13 number that you did not find on this page, do not hesitate to write us here.
Numerology 13
More about numerology 13 ...
№ 13 in other languages
| Spanish: | 🔊 (número 13) | trece |
| German: | 🔊 (Nummer 13) | dreizehn |
| French: | 🔊 (nombre 13) | treize |
| Portuguese: | 🔊 (número 13) | treze |
| Hindi: | 🔊 (संख्या 13) | तेरह |
| Chinese: | 🔊 (数 13) | 十三 |
| Arabian: | 🔊 (عدد 13) | ثلاثة عشر |
| Czech: | 🔊 (číslo 13) | třináct |
| Korean: | 🔊 (번호 13) | 십삼 |
| Danish: | 🔊 (nummer 13) | tretten |
| Hebrew: | (מספר 13) | שלש עשרה |
| Dutch: | 🔊 (nummer 13) | dertien |
| Japanese: | 🔊 (数 13) | 十三 |
| Indonesian: | 🔊 (jumlah 13) | tiga belas |
| Italian: | 🔊 (numero 13) | tredici |
| Norwegian: | 🔊 (nummer 13) | tretten |
| Polish: | 🔊 (liczba 13) | trzynaście |
| Russian: | 🔊 (номер 13) | тринадцать |
| Turkish: | 🔊 (numara 13) | onüç |
| Thai: | 🔊 (จำนวน 13) | สิบสาม |
| Ukrainian: | 🔊 (номер 13) | тринадцять |
| Vietnamese: | 🔊 (con số 13) | mười ba |
| Other languages ... | ||
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Frequently asked questions about the number 13
Is 13 prime and why?
The number 13 is a prime number because its divisors are: 1, 13.
How do you write the number 13 in words?
13 can be written as "thirteen".
Number 13 in News
| NASA: Marking 13 Years on Mars, NASA’s Curiosity Picks Up New Skills
New capabilities allow the rover to do science with less energy from its batteries. Thirteen years since Curiosity landed on Mars, engineers are finding ways to make the NASA rover even more productive. The six-wheeled robot has been given more autonomy and the ability to multitask — improvements designed to … Aug. 4, 2025 |
| BBC: Teeth marks suggest 'terror bird' was killed by reptile 13 million years ago
Terror birds could be taller than a human and had powerful legs and hooked, flesh-ripping beaks. July 23, 2025 |
| France24: Tunisian court sentences opposition figures to 13 to 66 years in prison
Prominent politicians, businessmen and lawyers are among those that have been sentenced to decades in prison by a Tunisian court on charges of conspiring against state security, state media said Saturday, as part of a mass trial against opposition figures and vocal critics of President Kais Saied's administration. April 19, 2025 |
| NASA: Apollo 13 Launch: 55 Years Ago
NASA astronauts Jim Lovell, Fred Haise, and Jack Swigert launch aboard the Apollo 13 spacecraft from NASA’s Kennedy Space Center in Florida on April 11, 1970. The mission seemed to be going smoothly until 55 hours and 55 minutes in when an oxygen tank ruptured. The new mission plan involved … April 11, 2025 |
| NyTimes: Live Updates: At Least 13 Dead in Myanmar After Strong Earthquake
The 7.7.-magnitude quake caused havoc across a swath of Southeast Asia. At least three deaths were reported in Bangkok. March 28, 2025 |

