odd, prime · 61st positive integer
The number 61
61 is an odd prime number. It is the 61st positive integer.
Quick reference
| Prime factorization | 61 (prime) |
| Divisors | 1, 61 |
| Binary | 111101 |
| Hexadecimal | 0x3D |
| Roman numeral | LXI |
| Digit sum | 7 |
| Properties | odd, prime |
Frequently asked
Is 61 a prime number?
Yes. 61 is prime — its only divisors are 1 and itself.
What are the factors of 61?
The factors (divisors) of 61 are 1, 61.
What is 61 in binary?
61 in binary is 111101. In hexadecimal it's 3D.
What is 61 as a Roman numeral?
61 in Roman numerals is LXI.
What's the digit sum of 61?
Adding the digits of 61: 6 + 1 = 7.