Number 13
Number 13 is said 🔊, write in letters as follows: thirteen . Ordinal number 13th is said 🔊 and write: thirteenth. The meaning of number 13: Basic maths, advanced mathematics and properties, computer science, numerology, codes and images, writing and naming in other languages, other interesting facts and comments. Number 13 in News.
Useful information about number 13
The decimal (Arabic) number 13 converted to a Roman number is XIII.
Roman and decimal number conversions.
13 kilograms (kg) = 28.7 pounds (lb)
13 pounds (lb) = 5.9 kilograms (kg)
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).
13° Fahrenheit (°F) equals to 55.4° Celsius (°C)
13° Celsius (°C) equals to 10.6° Fahrenheit (°F)
13 Horsepower (hp) equals to 9.56 kilowatts (kW)
13 kilowatts (kW) equals to 17.68 horsepower (hp)
The number 13 converted to a Mayan number is  
Decimal and Mayan number conversions. 
Weight conversion
13 kilograms (kg) = 28.7 pounds (lb)
13 pounds (lb) = 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 55.4° Celsius (°C)
13° Celsius (°C) equals to 10.6° 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:
Images of the number  
Image (1) of the number  Image (2) of the number 
There is no copyright for these images.
Number 13 infographic.

More images, other sizes, codes and colors ... 
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 official in Iran and Afghanistan.
Share in social networks
Mathematics of no. 13
Multiplications
Multiplication table of 13
13 multiplied by two equals 26 (13 x 2 = 26).
13 multiplied by three equals 39 (13 x 3 = 39).
13 multiplied by four equals 52 (13 x 4 = 52).
13 multiplied by five equals 65 (13 x 5 = 65).
show multiplications by 6, 7, 8, 9 ...
Fractions: decimal fraction and common fraction
Fraction table of 13
Half of 13 is 6,5 (13 / 2 = 6,5 = 6 1/2).
One third of 13 is 4,3333 (13 / 3 = 4,3333 = 4 1/3).
One quarter of 13 is 3,25 (13 / 4 = 3,25 = 3 1/4).
One fifth of 13 is 2,6 (13 / 5 = 2,6 = 2 3/5).
show fractions by 6, 7, 8, 9 ...
Calculator
13  
Advanced math operations
Is Prime?
The number 13 is a prime number. The closest prime numbers are 11, 17.
13th prime number in order is 41.
Factorization and dividers
Factorization 13 = 13
Divisors of number 13 are 1 , 13
Total Divisors 2.
Sum of Divisors 14.
Powers
The second power of 13^{2} is 169.
The third power of 13^{3} 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 = log_{e} 13 = 2,564949.
The logarithm to base 10 of No. log_{10} 13 = 1,113943.
The Napierian logarithm of No. log_{1/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.
Properties of the number 13
Is a Friedman number: NoIs a Fibonacci number: Yes
Is a Bell number: No
Is a palindromic number: No
Is a pentagonal number: No
Is a perfect number: No
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 
More SHA codes related to the number 13 ... 
Numerology 13
The meaning of the number 3 (three), numerology 3
Character frequency 3: 1
The number three (3) came to share genuine expression and sensitivity with the world. People associated with this number need to connect with their deepest emotions. The number 3 is characterized by its pragmatism, it is utilitarian, sagacious, dynamic, creative, it has objectives and it fulfills them. He/she is also selfexpressive in many ways and with communication skills.
More about the meaning of the number 3 (three), numerology 3 ...
The meaning of the number 1 (one), numerology 1
Character frequency 1: 1
Number one (1) came to develop or balance creativity, independence, originality, selfreliance and confidence in the world. It reflects power, creative strength, quick mind, drive and ambition. It is the sign of individualistic and aggressive nature.
More about the meaning of the number 1 (one), numerology 1 ...
Interesting facts about the number 13
Areas, mountains and surfaces
 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).
 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.
Astrology
 It is one of the lucky numbers for the zodiac sign Scorpio.
 ¿Qué es la astrología y para qué sirve?
Astronomy and space
 (13) Egeria es el asteroide número 13. Fue descubierto por A. de Gasparis desde Obs. Astronómico de Capodimonte, el 11/2/1850.
 Apollo 13 was a NASA Moon mission famous for being a 'successful failure' in 1970.
Distances between cities
 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).
In other fields
 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. Números del mal.
 Dreaming of the number 13 means transformation to the new, much higher and spiritual being.
Mathematics
 13 is the number of Archimedean solids.
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
 The best athletes to wear number 13
Wilt Chamberlain, NBA; Dan Marino, NFL; Alex Rodriguez, MLB; Steve Nash, NBA; James Harden, NBA  Ángel Nieto Roldán was a Spanish motorcycling pilot, world speed champion 13 times.
Superstitions
 For Spain and Latin America, Tuesday the 13th is bad luck. For France and Englishspeaking 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.Number 13 in other languages
How to say or write the number thirteen in Spanish, German, French and other languages.
Spanish:  🔊 (número 13)  trece 
German:  🔊 (Anzahl 13)  dreizehn 
French:  🔊 (nombre 13)  treize 
Portuguese:  🔊 (número 13)  treze 
Chinese:  🔊 (数 13)  十三 
Other languages ... 
News to email
Comment
If you know something interesting about the number 13 or any
natural number (positive integer).
For this topic there are no comments.
Legal Notices & Terms of Use
The content of the comments is the opinion of the users not of number.academy. It is not allowed to pour comments contrary to the laws, insulting, illicit or harmful to third parties. Number.academy reserves the right to remove or not make public any inappropriate comment. It also reserves the right to post a comment on another topic. Privacy Policy.
The content of the comments is the opinion of the users not of number.academy. It is not allowed to pour comments contrary to the laws, insulting, illicit or harmful to third parties. Number.academy reserves the right to remove or not make public any inappropriate comment. It also reserves the right to post a comment on another topic. Privacy Policy.
For this topic there are no comments.
Number 13 in News
CNN: At least 13 people were injured in a shooting in downtown Austin, authorities say At least 13 people were injured early Saturday morning in a shooting in downtown Austin, Texas, officials said. ... June 12, 2021

BBC: Pembrokeshire school bus crash: Car driver dies and 13 children hurt Two of the 13 children hurt in Monday morning's school bus crash were taken to hospital. ... May 17, 2021

Buzz: Research Shows These Are The 13 Countries People Struggle To Identify On A Map – Can You Guess Even Half Right? Do you know your countries by sight?View Entire Post › ... Feb. 17, 2021
