odd, composite, triangular · 45th positive integer
The number 45
45 is an odd composite number. It is the 45th positive integer.
Quick reference
| Prime factorization | 3 × 3 × 5 |
| Divisors | 1, 3, 5, 9, 15, 45 |
| Binary | 101101 |
| Hexadecimal | 0x2D |
| Roman numeral | XLV |
| Digit sum | 9 |
| Properties | odd, composite, triangular |
Frequently asked
Is 45 a prime number?
No. 45 is composite. Its prime factorization is 3 × 3 × 5.
What are the factors of 45?
The factors (divisors) of 45 are 1, 3, 5, 9, 15, 45.
What is 45 in binary?
45 in binary is 101101. In hexadecimal it's 2D.
What is 45 as a Roman numeral?
45 in Roman numerals is XLV.
What's the digit sum of 45?
Adding the digits of 45: 4 + 5 = 9.