The number 7

Representation numerals

Greek numeral: ζʹ

Arabic numeral: ٧

Roman numeral: VII

Numeral systems

Binary: 111

Septimal (base 7): 10

Octal: 7

Hexadecimal: 7

Factorization

7 is a prime number (Gaussian prime)

Sums & differences

Difference of 2 squares: 7 = 4² - 3²

Characteristics

7 is a heptagonal number

Related primes

The 7th prime number is: 17

Previous prime number: 5 — Next prime number: 11

This number is a twin prime, the other twin is 5

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