odd, composite, perfect square · 25th positive integer
The number 25
25 is an odd composite number. It's known as the perfect square of 5. It is the 25th positive integer.
Quick reference
| Prime factorization | 5 × 5 |
| Divisors | 1, 5, 25 |
| Binary | 11001 |
| Hexadecimal | 0x19 |
| Roman numeral | XXV |
| Digit sum | 7 |
| Properties | odd, composite, perfect square |
Why 25 is notable
The perfect square of 5.
Frequently asked
Is 25 a prime number?
No. 25 is composite. Its prime factorization is 5 × 5.
What are the factors of 25?
The factors (divisors) of 25 are 1, 5, 25.
What is 25 in binary?
25 in binary is 11001. In hexadecimal it's 19.
What is 25 as a Roman numeral?
25 in Roman numerals is XXV.
What's the digit sum of 25?
Adding the digits of 25: 2 + 5 = 7.