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.

Reading 5 in NumGrid context

5 is one of the data points covered by this site’s integer properties and number-guessing puzzles dataset. The detail above comes directly from classical number theory plus NumGrid solver-derived puzzle statistics; the context that follows situates the headline numbers against the broader distribution across positive integers within the NumGrid target pool.

Every number on this page links back to classical number theory plus NumGrid solver-derived puzzle statistics; the methodology page describes the inputs, refresh cadence, and known limitations of the underlying data product.

For readers using this page as a decision input, the related-entity pages elsewhere on the site provide the comparison set. The most useful comparison for 5 is typically a peer within positive integers within the NumGrid target pool with similar size, similar exposure, or similar geography — not the national-level summary alone.