odd, composite, palindrome · 99th positive integer
The number 99
99 is an odd composite number. It is the 99th positive integer.
Quick reference
| Prime factorization | 3 × 3 × 11 |
| Divisors | 1, 3, 9, 11, 33, 99 |
| Binary | 1100011 |
| Hexadecimal | 0x63 |
| Roman numeral | XCIX |
| Digit sum | 18 |
| Properties | odd, composite, palindrome |
Frequently asked
Is 99 a prime number?
No. 99 is composite. Its prime factorization is 3 × 3 × 11.
What are the factors of 99?
The factors (divisors) of 99 are 1, 3, 9, 11, 33, 99.
What is 99 in binary?
99 in binary is 1100011. In hexadecimal it's 63.
What is 99 as a Roman numeral?
99 in Roman numerals is XCIX.
What's the digit sum of 99?
Adding the digits of 99: 9 + 9 = 18.