odd, prime, Fibonacci, palindrome · 5th positive integer
The number 5
5 is an odd prime number. It's known as a Fibonacci number and the number of senses humans traditionally have. It is the 5th positive integer.
Quick reference
| Prime factorization | 5 (prime) |
| Divisors | 1, 5 |
| Binary | 101 |
| Hexadecimal | 0x5 |
| Roman numeral | V |
| Digit sum | 5 |
| Properties | odd, prime, Fibonacci, palindrome |
Why 5 is notable
A Fibonacci number and the number of senses humans traditionally have.
Frequently asked
Is 5 a prime number?
Yes. 5 is prime — its only divisors are 1 and itself.
What are the factors of 5?
The factors (divisors) of 5 are 1, 5.
What is 5 in binary?
5 in binary is 101. In hexadecimal it's 5.
What is 5 as a Roman numeral?
5 in Roman numerals is V.
What's the digit sum of 5?
Adding the digits of 5: 5 = 5.