odd, composite · 309th positive integer
The number 309
309 is an odd composite number. It is the 309th positive integer.
Quick reference
| Prime factorization | 3 × 103 |
| Divisors | 1, 3, 103, 309 |
| Binary | 100110101 |
| Hexadecimal | 0x135 |
| Roman numeral | CCCIX |
| Digit sum | 12 |
| Properties | odd, composite |
Frequently asked
Is 309 a prime number?
No. 309 is composite. Its prime factorization is 3 × 103.
What are the factors of 309?
The factors (divisors) of 309 are 1, 3, 103, 309.
What is 309 in binary?
309 in binary is 100110101. In hexadecimal it's 135.
What is 309 as a Roman numeral?
309 in Roman numerals is CCCIX.
What's the digit sum of 309?
Adding the digits of 309: 3 + 0 + 9 = 12.