The number 31

Representation numerals

Greek numeral: λαʹ

Arabic numeral: ٣١

Roman numeral: XXXI

Numeral systems

Binary: 11111

Septimal (base 7): 43

Octal: 37

Hexadecimal: 1f

Factorization

31 is a prime number (Gaussian prime)

Sums & differences

Difference of 2 squares: 31 = 16² - 15²

Characteristics

Related primes

The 31th prime number is: 127

Previous prime number: 29 — Next prime number: 37

This number is a twin prime, the other twin is 29

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