odd, prime · 691st positive integer
The number 691
691 is an odd prime number. It is the 691st positive integer.
Quick reference
| Prime factorization | 691 (prime) |
| Divisors | 1, 691 |
| Binary | 1010110011 |
| Hexadecimal | 0x2B3 |
| Roman numeral | DCXCI |
| Digit sum | 16 |
| Properties | odd, prime |
Frequently asked
Is 691 a prime number?
Yes. 691 is prime — its only divisors are 1 and itself.
What are the factors of 691?
The factors (divisors) of 691 are 1, 691.
What is 691 in binary?
691 in binary is 1010110011. In hexadecimal it's 2B3.
What is 691 as a Roman numeral?
691 in Roman numerals is DCXCI.
What's the digit sum of 691?
Adding the digits of 691: 6 + 9 + 1 = 16.