11
Everything about the number 11 — its names, how to write it in other bases and numeral systems, and what makes it interesting mathematically.
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Names of 11
| Nominal | 11 |
| Cardinal | eleven |
| Ordinal | 11th |
| This number as US currency | eleven dollars |
Properties (and some facts) of 11
| Is 11 an odd number? | 11 is an odd number |
| Is 11 an even number? | 11 is not an even number |
| Is 11 a palindrome? | 11 is a palindrome |
| Is 11 a triangle number? | 11 is not a triangle number |
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11 in other bases
| Base 2 (Binary) | 1011 |
| Base 3 (Ternary) | 102 |
| Base 4 (Quaternary) | 23 |
| Base 5 (Quinary) | 21 |
| Base 6 (Senary) | 15 |
| Base 8 (Octal) | 13 |
| Base 12 (Duodecimal) | B |
| Base 16 (Hexadecimal) | B |
| Base 20 (Vigesimal) | B |
Primes and factors tests for 11
| Is 11 a prime number? | 11 is a prime number |
| Is 11 a perfect number? | 11 is not a perfect number |
| Is 11 a Mersenne prime? | 11 is not a Mersenne prime |
| Is 11 a Fermat prime? | 11 is not a Fermat prime |
| Is 11 a Fibonacci prime? | 11 is not a Fibonacci prime |
| Is 11 a partition prime? | 11 is a partition prime |
| Is 11 a Pell prime? | 11 is not a Pell prime |
| Prime Factors | Prime factors of 11 |
11 in other numeral systems
| 11 in Roman numerals | XI |
| 11 in Chinese numerals | 壹拾壹 |
| 11 in Babylonian numerals |  |
| 11 in Egyptian numerals | 𓎆𓏺 |
Roots and squares for 11
| Is 11 a square number? | 11 is not a square number |
| Is 11 a cube number? | 11 is not a cube number |
| Square root of 11 | 3.3166247903554 |
| Cube root of 11 | 2.2239800905693 |
Recreational math for 11
| Number 11 reversed | 11 |
| Sum of the digits | 2 |
| Number of digits | 2 |
Arithmetic tables for 11
Other pages about 11
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