17 (number)

This article is about the number seventeen. For the year, see 17.

17 (seventeen) is a number. It comes between sixteen and eighteen, and is an odd number. It is also the 7th prime number, after 2, 3, 5, 7, 11, and 13. In ordinal, It is 17th (seventeenth). In Italy, 17 is considered an unlucky number.

← 16 17 18 →
← 10 11 12 13 14 15 16 17 18 19 → List of numbers — Integers ← 0 10 20 30 40 50 60 70 80 90 →
Cardinal	seventeen
Ordinal	17th (seventeenth)
Numeral system	septendecimal
Factorization	prime
Prime	7th
Divisors	1, 17
Greek numeral	ΙΖ´
Roman numeral	XVII
Binary	100012
Ternary	1223
Quaternary	1014
Quinary	325
Senary	256
Octal	218
Duodecimal	1512
Hexadecimal	1116
Vigesimal	H20
Base 36	H36

In Roman numerals, 17 is written as XVII.