odd, composite · 981st positive integer
The number 981
981 is an odd composite number. It is the 981st positive integer.
Quick reference
| Prime factorization | 3 × 3 × 109 |
| Divisors | 1, 3, 9, 109, 327, 981 |
| Binary | 1111010101 |
| Hexadecimal | 0x3D5 |
| Roman numeral | CMLXXXI |
| Digit sum | 18 |
| Properties | odd, composite |
Frequently asked
Is 981 a prime number?
No. 981 is composite. Its prime factorization is 3 × 3 × 109.
What are the factors of 981?
The factors (divisors) of 981 are 1, 3, 9, 109, 327, 981.
What is 981 in binary?
981 in binary is 1111010101. In hexadecimal it's 3D5.
What is 981 as a Roman numeral?
981 in Roman numerals is CMLXXXI.
What's the digit sum of 981?
Adding the digits of 981: 9 + 8 + 1 = 18.