15
Everything about the number 15 — its names, how to write it in other bases and numeral systems, and what makes it interesting mathematically.
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Names of 15
| Nominal | 15 |
| Cardinal | fifteen |
| Ordinal | 15th |
| This number as US currency | fifteen dollars |
Properties (and some facts) of 15
| Is 15 an odd number? | 15 is an odd number |
| Is 15 an even number? | 15 is not an even number |
| Is 15 a palindrome? | 15 is not a palindrome |
| Is 15 a triangle number? | 15 is a triangle number |
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15 in other bases
| Base 2 (Binary) | 1111 |
| Base 3 (Ternary) | 120 |
| Base 4 (Quaternary) | 33 |
| Base 5 (Quinary) | 30 |
| Base 6 (Senary) | 23 |
| Base 8 (Octal) | 17 |
| Base 12 (Duodecimal) | 13 |
| Base 16 (Hexadecimal) | F |
| Base 20 (Vigesimal) | F |
Primes and factors tests for 15
| Is 15 a prime number? | 15 is not a prime number |
| Is 15 a perfect number? | 15 is not a perfect number |
| Is 15 a Mersenne prime? | 15 is not a Mersenne prime |
| Is 15 a Fermat prime? | 15 is not a Fermat prime |
| Is 15 a Fibonacci prime? | 15 is not a Fibonacci prime |
| Is 15 a partition prime? | 15 is not a partition prime |
| Is 15 a Pell prime? | 15 is not a Pell prime |
| Prime Factors | Prime factors of 15 |
15 in other numeral systems
| 15 in Roman numerals | XV |
| 15 in Chinese numerals | 壹拾伍 |
| 15 in Babylonian numerals |  |
| 15 in Egyptian numerals | 𓎆𓏾 |
Roots and squares for 15
| Is 15 a square number? | 15 is not a square number |
| Is 15 a cube number? | 15 is not a cube number |
| Square root of 15 | 3.8729833462074 |
| Cube root of 15 | 2.4662120743305 |
Recreational math for 15
| Number 15 reversed | 51 |
| Sum of the digits | 6 |
| Number of digits | 2 |
Arithmetic tables for 15
Other pages about 15
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