The number 11

Representation numerals

Greek numeral: ιαʹ

Arabic numeral: ١١

Roman numeral: XI

Numeral systems

Binary: 1011

Septimal (base 7): 14

Octal: 13

Hexadecimal: b

Factorization

11 is a prime number (Gaussian prime)

Sums & differences

Difference of 2 squares: 11 = 6² - 5²

Characteristics

Related primes

The 11th prime number is: 31

Previous prime number: 7 — Next prime number: 13

This number is a twin prime, the other twin is 13

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