Number 11 facts
The odd number 11 is spelled 🔊, and written in words: eleven. The ordinal number 11st is said 🔊 and written as: eleventh. The meaning of the number 11 in Maths: Is it Prime? Factorization and prime factors tree. The square root and cube root of 11. What is 11 in computer science, numerology, codes and images, photo art, writing and naming in other languages. Other interesting facts, news related to 11. ‹‹ 10 12 ››
Interesting facts about the number 11
Asteroids
- (11) Parthenope is asteroid number 11. It was discovered by A. de Gasparis from Obs. Capodimonte Astronomical on 5/11/1850.
Aircrafts and flights
- 09/11/2001 the American Airlines plane, flight number 11, Boeing 767-223ER crashed in New York City, US 81 passengers and 11 crew members died.
- 11/27/1983 the Avianca plane, flight number 011, Boeing 747-283B crashed in Madrid, Spain 162 passengers and 19 crew members died.
Areas, mountains and surfaces
- The total area of Sulawesi is 69,761 square miles (180,681 square km). Country Indonesia (Gorontalo and Central, North, South, Southeast and West Sulawesi). 11th largest island in the world.
Astrology
- It is one of the lucky numbers for the zodiac sign Taurus and Pisces.
- What is astrology and what is it for?
Games
History and politics
- United Nations Security Council Resolution number 11, adopted 15 November 1946. Switzerland and the International Court of Justice. Resolution text.
- 11 Downing Street The address of the UK Chancellor of the Treasury's London residence.
In other fields
- September 11 is La Diada Nacional de Catalunya or Diada.
- The attacks of September 11, 2001 (commonly referred to as 9/11 or 9/11) were a series of suicide terrorist attacks committed that day in the United States.
- The attacks of March 11, 2004, known by the number 11M, were a series of terrorist attacks on four trains of the Madrid Cercanías network.
- If you dream of the number 11 you should keep in mind that it symbolizes that the universe will help you face trials.
Literature
- The ISBN Group Identifier for books published in South Korea. Example book: ISBN 979-11-86178-14-0 Edward Y. J. Chung, Korean Confucianism: Tradition and Modernity. Academy of Korean Studies (2015)
Mathematics
- 11 is the smallest prime such that 2p-1 is not prime
- 11 is the largest number which is not expressible as the sum of two composite numbers
- 11 is the only prime comprising an even number of identical digits
- 11 is the largest known multiplicative persistence.
Music
- '11: 11 'is a song by the Canadian-American singer Rufus Wainwright or the South Korean singer Taeyeon.
- '11' is a song by the American singer-songwriter Cassadee Pope.
Science
- Sodium is the chemical element in the periodic table that has the symbol Na and atomic number 11.
Sports
- The best athletes to wear number 11
Isaiah Thomas, NBA; Mark Messier, NHL; Elvin Hayes, NBA; Yao Ming, NBA; Cale Yarborough, NASCAR; Teresa Weatherspoon, WNBA
Superstitions
- New spiritual trends claim that 11:11 on a clock refers to the signs of protectors or spirit guides.
Please write us
If you know something interesting about the number 11 or any natural number (positive integer), please write to us.What is 11 in other units
| The number 11 converted to a Mayan number is |
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| Decimal and Mayan number conversions. |
Weight conversion
11 kilograms (kg) = 24.3 pounds (lbs)
11 pounds (lbs) = 5.0 kilograms (kg)
Length conversion
11 kilometers (km) equals to 6.835 miles (mi).
11 miles (mi) equals to 17.703 kilometers (km).
11 meters (m) equals to 17.703 feet (ft).
11 feet (ft) equals 3.353 meters (m).
11 centimeters (cm) equals to 4.3 inches (in).
11 inches (in) equals to 27.9 centimeters (cm).
Temperature conversion
11° Fahrenheit (°F) equals to -11.7° Celsius (°C)
11° Celsius (°C) equals to 51.8° Fahrenheit (°F)
Power conversion
11 Horsepower (hp) equals to 8.09 kilowatts (kW)
11 kilowatts (kW) equals to 14.96 horsepower (hp)
Codes and images of the number 11
Number 11 morse code: .---- .----Sign language for number 11:
Number 11 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 11 infographic
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Year 11 AD
- TheYellow River overflowed it's banks, leaving millions homeless and creating a widespread famine in the Chinese Empire.
- In the year 11 AD, Augustus put a ban on individual consultation of astrologers.
- Drusilla, daughter of Germanicus and Agrippina the younger was born in the year 11 AD.
- Tiberius weds Julia Caesaris.
- Marcus Antistius Labeo prominent Roman jurist died.
- Artabanus III of the Arsacid Dynasty becomes ruler of Parthia
Gregorian, Hebrew, Islamic, Persian and Buddhist Year (Calendar)
Gregorian year 11 is Buddhist year 554.Buddhist year 11 is Gregorian year 532 a. C.
Gregorian year 11 is Islamic year -630 or -629.
Islamic year 11 is Gregorian year 632 or 633.
Gregorian year 11 is Persian year -612 or -611.
Persian year 11 is Gregorian 632 or 633.
Gregorian year 11 is Hebrew year 3771 or 3772.
Hebrew year 11 is Gregorian year 3749 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 11 is a prime number. The closest prime numbers are 7, 13.
The 11st prime number in order is 31.
Factorization and factors (dividers)
The prime factors of 11
Prime numbers have no prime factors smaller than themselves.
The factors of 11 are 1, 11.
Total factors 2.
Sum of factors 12 (1).
Prime factor tree
11 is a prime number.
Powers
The second power of 112 is 121.
The third power of 113 is 1.331.
Roots
The square root √11 is 3,316625.
The cube root of 3√11 is 2,22398.
Logarithms
The natural logarithm of No. ln 11 = loge 11 = 2,397895.
The logarithm to base 10 of No. log10 11 = 1,041393.
The Napierian logarithm of No. log1/e 11 = -2,397895.
Trigonometric functions
The cosine of 11 is 0,004426.The sine of 11 is -0,99999.
The tangent of 11 is -225,950846.
Properties of the number 11
More math properties ...
Number 11 in Computer Science
| Code type | Code value |
|---|---|
| Port 11/TCP, UDP | SYSTAT protocol |
| Unix time | Unix time 11 is equal to Thursday Jan. 1, 1970, 12:11 a.m. GMT |
| IPv4, IPv6 | Number 11 internet address in dotted format v4 0.0.0.11, v6 ::b |
| 11 Binary | = 3 Decimal |
| 11 Decimal | = 1011 Binary |
| 11 Decimal | = 102 Ternary |
| 11 Decimal | = 13 Octal |
| 11 Decimal | = B Hexadecimal (0xb hex) |
| 11 BASE64 | MTE= |
| 11 MD5 | 6512bd43d9caa6e02c990b0a82652dca |
| 11 SHA1 | 17ba0791499db908433b80f37c5fbc89b870084b |
| 11 SHA224 | 161a68601ec1d8ca45250557cff3ffb98eca53fbcf86bbdb8e8bb6e7 |
| 11 SHA256 | 4fc82b26aecb47d2868c4efbe3581732a3e7cbcc6c2efb32062c08170a05eeb8 |
| 11 SHA384 | 9b20aa6472eef4fd186d231637b1c1d55a5a434cc9130d6afcaaf486253a20c23a4eaeea419594c17f46bc53c7cee12e |
| More SHA codes related to the number 11 ... | |
If you know something interesting about the 11 number that you did not find on this page, do not hesitate to write us here.
Numerology 11
More about numerology 11 ...
№ 11 in other languages
| Spanish: | 🔊 (número 11) | once |
| German: | 🔊 (Nummer 11) | elf |
| French: | 🔊 (nombre 11) | onze |
| Portuguese: | 🔊 (número 11) | onze |
| Hindi: | 🔊 (संख्या 11) | ग्यारह |
| Chinese: | 🔊 (数 11) | 十一 |
| Arabian: | 🔊 (عدد 11) | أحد عشر |
| Czech: | 🔊 (číslo 11) | jedenáct |
| Korean: | 🔊 (번호 11) | 십일 |
| Danish: | 🔊 (nummer 11) | elleve |
| Hebrew: | (מספר 11) | אחת עשרה |
| Dutch: | 🔊 (nummer 11) | elf |
| Japanese: | 🔊 (数 11) | 十一 |
| Indonesian: | 🔊 (jumlah 11) | sebelas |
| Italian: | 🔊 (numero 11) | undici |
| Norwegian: | 🔊 (nummer 11) | elleve |
| Polish: | 🔊 (liczba 11) | jedenaście |
| Russian: | 🔊 (номер 11) | одиннадцать |
| Turkish: | 🔊 (numara 11) | onbir |
| Thai: | 🔊 (จำนวน 11) | สิบเอ็ด |
| Ukrainian: | 🔊 (номер 11) | одинадцять |
| Vietnamese: | 🔊 (con số 11) | mười một |
| Other languages ... | ||
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Frequently asked questions about the number 11
Is 11 prime and why?
The number 11 is a prime number because its divisors are: 1, 11.
How do you write the number 11 in words?
11 can be written as "eleven".
Number 11 in News
| BBC: After 11 months of negativity, have Man Utd turned the corner?
Manchester United have recorded three consecutive Premier League wins under Ruben Amorim for the first time. Oct. 25, 2025 |
| France24: Sweden recognised Palestine 11 years ago – Here’s what happened
In the fall of 2014, Sweden became the first western EU country to recognise the state of Palestine. The small Nordic nation had hoped to spark a European-wide tide of recognitions. Instead, it found itself isolated – and left to pay a steep price in its diplomatic relations with Israel. … Sept. 25, 2025 |
| France24: Houthi rebels detain at least 11 UN personnel, envoy to Yemen says
The United Nations envoy to Yemen, Hans Grundberg, condemned the “arbitrary detentions” of at least 11 UN staff by Houthi rebels on Sunday and demanded that they be “immediately and unconditionally” released. Those arrested included seven World Food Programme employees and three UNICEF workers, a security source in Sanaa told … Aug. 31, 2025 |
| France24: At least 11 killed, dozens injured during Kenya's 'Saba Saba Day' protests
Police in Kenya clashed with demonstrators during anti-government protests on July 7, known as "Saba Saba Day", resulting in the deaths of at least 11 people. More than 500 people were arrested, according to the national police service. The unrest follows recent violence sparked by police accountability issues, including the … July 7, 2025 |
| The Sydney Morning Herald: At least 11 die in stampede in India after IPL win
At least 11 people are dead and more than 30 injured after a stampede in India. June 5, 2025 |

