13
Everything about the number 13 — its names, how to write it in other bases and numeral systems, and what makes it interesting mathematically.
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Names of 13
| Nominal | 13 |
| Cardinal | thirteen |
| Ordinal | 13th |
| This number as US currency | thirteen dollars |
Properties (and some facts) of 13
| Is 13 an odd number? | 13 is an odd number |
| Is 13 an even number? | 13 is not an even number |
| Is 13 a palindrome? | 13 is not a palindrome |
| Is 13 a triangle number? | 13 is not a triangle number |
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13 in other bases
| Base 2 (Binary) | 1101 |
| Base 3 (Ternary) | 111 |
| Base 4 (Quaternary) | 31 |
| Base 5 (Quinary) | 23 |
| Base 6 (Senary) | 21 |
| Base 8 (Octal) | 15 |
| Base 12 (Duodecimal) | 11 |
| Base 16 (Hexadecimal) | D |
| Base 20 (Vigesimal) | D |
Primes and factors tests for 13
| Is 13 a prime number? | 13 is a prime number |
| Is 13 a perfect number? | 13 is not a perfect number |
| Is 13 a Mersenne prime? | 13 is not a Mersenne prime |
| Is 13 a Fermat prime? | 13 is not a Fermat prime |
| Is 13 a Fibonacci prime? | 13 is a Fibonacci prime |
| Is 13 a partition prime? | 13 is not a partition prime |
| Is 13 a Pell prime? | 13 is not a Pell prime |
| Prime Factors | Prime factors of 13 |
13 in other numeral systems
| 13 in Roman numerals | XIII |
| 13 in Chinese numerals | 壹拾叄 |
| 13 in Babylonian numerals |  |
| 13 in Egyptian numerals | 𓎆𓏼 |
Roots and squares for 13
| Is 13 a square number? | 13 is not a square number |
| Is 13 a cube number? | 13 is not a cube number |
| Square root of 13 | 3.605551275464 |
| Cube root of 13 | 2.3513346877208 |
Recreational math for 13
| Number 13 reversed | 31 |
| Sum of the digits | 4 |
| Number of digits | 2 |
Arithmetic tables for 13
Other pages about 13
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