odd, composite · 381st positive integer
The number 381
381 is an odd composite number. It is the 381st positive integer.
Quick reference
| Prime factorization | 3 × 127 |
| Divisors | 1, 3, 127, 381 |
| Binary | 101111101 |
| Hexadecimal | 0x17D |
| Roman numeral | CCCLXXXI |
| Digit sum | 12 |
| Properties | odd, composite |
Frequently asked
Is 381 a prime number?
No. 381 is composite. Its prime factorization is 3 × 127.
What are the factors of 381?
The factors (divisors) of 381 are 1, 3, 127, 381.
What is 381 in binary?
381 in binary is 101111101. In hexadecimal it's 17D.
What is 381 as a Roman numeral?
381 in Roman numerals is CCCLXXXI.
What's the digit sum of 381?
Adding the digits of 381: 3 + 8 + 1 = 12.