odd, composite · 261st positive integer
The number 261
261 is an odd composite number. It is the 261st positive integer.
Quick reference
| Prime factorization | 3 × 3 × 29 |
| Divisors | 1, 3, 9, 29, 87, 261 |
| Binary | 100000101 |
| Hexadecimal | 0x105 |
| Roman numeral | CCLXI |
| Digit sum | 9 |
| Properties | odd, composite |
Frequently asked
Is 261 a prime number?
No. 261 is composite. Its prime factorization is 3 × 3 × 29.
What are the factors of 261?
The factors (divisors) of 261 are 1, 3, 9, 29, 87, 261.
What is 261 in binary?
261 in binary is 100000101. In hexadecimal it's 105.
What is 261 as a Roman numeral?
261 in Roman numerals is CCLXI.
What's the digit sum of 261?
Adding the digits of 261: 2 + 6 + 1 = 9.