odd, composite, triangular · 231st positive integer
The number 231
231 is an odd composite number. It is the 231st positive integer.
Quick reference
| Prime factorization | 3 × 7 × 11 |
| Divisors | 1, 3, 7, 11, 21, 33, 77, 231 |
| Binary | 11100111 |
| Hexadecimal | 0xE7 |
| Roman numeral | CCXXXI |
| Digit sum | 6 |
| Properties | odd, composite, triangular |
Frequently asked
Is 231 a prime number?
No. 231 is composite. Its prime factorization is 3 × 7 × 11.
What are the factors of 231?
The factors (divisors) of 231 are 1, 3, 7, 11, 21, 33, 77, 231.
What is 231 in binary?
231 in binary is 11100111. In hexadecimal it's E7.
What is 231 as a Roman numeral?
231 in Roman numerals is CCXXXI.
What's the digit sum of 231?
Adding the digits of 231: 2 + 3 + 1 = 6.