Discover a lot of information on the number 11: properties, mathematical operations, how to write it, symbolism, numerology, representations and many other interesting things!

## Mathematical properties of 11

Questions and answers |

Is 11 a prime number? |
Yes |

Is 11 a perfect number? |
No |

Number of divisors |
2 |

List of dividers |
1, 11 |

Sum of divisors |
12 |

Prime factorization |
11 |

Prime factors |
11 |

## How to write / spell 11 in letters?

In letters, the number 11 is written as: Eleven. And in other languages? how does it spell?

11 in other languages |

Write 11 in english |
Eleven |

Write 11 in french |
Onze |

Write 11 in spanish |
Once |

Write 11 in portuguese |
Onze |

## Decomposition of the number 11

The number 11 is composed of:

2 iterations **of the number 1** : The number 1 (one) represents the uniqueness, the unique, a starting point, a beginning.... Find out more about the number 1

## Mathematical representations and links

Other ways to write 11 |

In letter |
Eleven |

In roman numeral |
XI |

In binary |
1011 |

In octal |
13 |

In hexadecimal |
b |

In US dollars |
USD 11.00 ($) |

In euros |
11,00 EUR (€) |

Some related numbers |

Previous number |
10 |

Next number |
12 |

Next prime number |
13 |

## Mathematical operations

Operations and solutions |

11*2 |
= |
22 |
The double of 11 is 22 |

11*3 |
= |
33 |
The triple of 11 is 33 |

11/2 |
= |
5.5 |
The half of 11 is 5.500000 |

11/3 |
= |
3.6666666666667 |
The third of 11 is 3.666667 |

11^{2} |
= |
121 |
The square of 11 is 121.000000 |

11^{3} |
= |
1331 |
The cube of 11 is 1331.000000 |

√11 |
= |
3.3166247903554 |
The square root of 11 is 3.316625 |

log(11) |
= |
2.3978952727984 |
The natural (Neperian) logarithm of 11 is 2.397895 |

log10(11) |
= |
1.0413926851582 |
The decimal logarithm (base 10) of 11 is 1.041393 |

sin(11) |
= |
-0.9999902065507 |
The sine of 11 is -0.999990 |

cos(11) |
= |
0.0044256979880508 |
The cosine of 11 is 0.004426 |

tan(11) |
= |
-225.9508464542 |
The tangent of 11 is -225.950846 |