Number 171 is not a prime number. It is a composite number.

A prime number is a natural number greater than 1 that is not a product of two smaller natural numbers. We do not consider 171 as a prime number, because it can be written as a product of two smaller natural numbers (check the factors of number 171 below).

Number of factors: 6.

List of factors/divisors: 1, 3, 9, 19, 57, 171.

Parity: 171 is an odd number.

Perfect square: no (a square number or perfect square is an integer that is the square of an integer).

Perfect number: no, because the sum of its proper divisors is 89 (perfect number is a positive integer that is equal to the sum of its proper divisors).

Number: Prime number: | 164 no | 165 no | 166 no | 167 yes | 168 no | 169 no | 170 no | 171 no | 172 no | 173 yes | 174 no | 175 no | 176 no | 177 no | 178 no |
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