odd, prime, palindrome · 191st positive integer
The number 191
191 is an odd prime number. It is the 191st positive integer.
Quick reference
| Prime factorization | 191 (prime) |
| Divisors | 1, 191 |
| Binary | 10111111 |
| Hexadecimal | 0xBF |
| Roman numeral | CXCI |
| Digit sum | 11 |
| Properties | odd, prime, palindrome |
Frequently asked
Is 191 a prime number?
Yes. 191 is prime — its only divisors are 1 and itself.
What are the factors of 191?
The factors (divisors) of 191 are 1, 191.
What is 191 in binary?
191 in binary is 10111111. In hexadecimal it's BF.
What is 191 as a Roman numeral?
191 in Roman numerals is CXCI.
What's the digit sum of 191?
Adding the digits of 191: 1 + 9 + 1 = 11.