# 171 (number)

 ← 170 171 172 →
Cardinal one hundred seventy-one
Ordinal 171st
(one hundred seventy-first)
Factorization 32× 19
Divisors 1, 3, 9, 19, 57, 171
Greek numeral ΡΟΑ´
Roman numeral CLXXI
Binary 101010112
Ternary 201003
Quaternary 22234
Quinary 11415
Senary 4436
Octal 2538
Duodecimal 12312
Vigesimal 8B20
Base 36 4R36

171 (one hundred [and] seventy-one) is the natural number following 170 and preceding 172.

## In mathematics

171 is an odd number, a composite number, and a deficient number. It is also a triangular number, a tridecagonal number[1] and a 58-gonal number.

171 is a Harshad number, a palindromic number, and an undulating number. 171 is a repdigit in base 7 (333), and also in bases 18, 56, and 170.

171 is also: