25
Everything about the number 25 — its names, how to write it in other bases and numeral systems, and what makes it interesting mathematically.
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Names of 25
| Nominal | 25 |
| Cardinal | twenty-five |
| Ordinal | 25th |
| This number as US currency | twenty-five dollars |
Properties (and some facts) of 25
| Is 25 an odd number? | 25 is an odd number |
| Is 25 an even number? | 25 is not an even number |
| Is 25 a palindrome? | 25 is not a palindrome |
| Is 25 a triangle number? | 25 is not a triangle number |
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25 in other bases
| Base 2 (Binary) | 11001 |
| Base 3 (Ternary) | 221 |
| Base 4 (Quaternary) | 121 |
| Base 5 (Quinary) | 100 |
| Base 6 (Senary) | 41 |
| Base 8 (Octal) | 31 |
| Base 12 (Duodecimal) | 21 |
| Base 16 (Hexadecimal) | 19 |
| Base 20 (Vigesimal) | 15 |
Primes and factors tests for 25
| Is 25 a prime number? | 25 is not a prime number |
| Is 25 a perfect number? | 25 is not a perfect number |
| Is 25 a Mersenne prime? | 25 is not a Mersenne prime |
| Is 25 a Fermat prime? | 25 is not a Fermat prime |
| Is 25 a Fibonacci prime? | 25 is not a Fibonacci prime |
| Is 25 a partition prime? | 25 is not a partition prime |
| Is 25 a Pell prime? | 25 is not a Pell prime |
| Prime Factors | Prime factors of 25 |
25 in other numeral systems
| 25 in Roman numerals | XXV |
| 25 in Chinese numerals | 貳拾伍 |
| 25 in Babylonian numerals |  |
| 25 in Egyptian numerals | 𓎇𓏾 |
Roots and squares for 25
| Is 25 a square number? | 25 is a square number |
| Is 25 a cube number? | 25 is not a cube number |
| Square root of 25 | 5 |
| Cube root of 25 | 2.9240177382129 |
Recreational math for 25
| Number 25 reversed | 52 |
| Sum of the digits | 7 |
| Number of digits | 2 |
Arithmetic tables for 25
Other pages about 25
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