Number

17

17 — Seventeen

17 is a prime, odd, a calendar year.

Seventeen is the seventh prime, and is famously the favorite ‘random’ number people pick when asked. It is the only prime that is the sum of four consecutive primes (2 + 3 + 5 + 7).

Sources https://en.wikipedia.org/wiki/17_(number)

Cousin Prime Curated Deficient Number Prime Sexy Prime Squarefree Twin Prime

Properties

Parity: Odd
Digit count: 2
Digit sum: 8
Digital root: 8
Palindrome: No
Divisor count: 2
σ(n) — sum of divisors: 18

Primality

17 is prime. It has exactly two divisors: 1 and itself.

Divisors & multiples

All divisors (2)

1 · 17

Aliquot sum (sum of proper divisors): 1

Factor pairs (a × b = 17)

1 × 17

First multiples

17 · 34 · 51 · 68 · 85 · 102 · 119 · 136 · 153 · 170

Representations

In words: seventeen
Ordinal: 17th
Roman numeral: XVII
Binary: 10001
Octal: 21
Hexadecimal: 11

Also seen as

Prime neighborhood

Adjacent primes:

Previous prime: 13 (gap of 4)
Next prime: 19 (gap of 2)

Pair status: twin with 19, cousin with 13.

ASCII character

As an ASCII codepoint, 17 is control character (0x11). ASCII control character.

Hex color

#000011

RGB(0, 0, 17)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.0.17.