Number 181 is a prime number.

A prime number is a natural number greater than 1 that is not a product of two smaller natural numbers. Therefore we consider 181 as a prime number, because:

- 181 is a natural number greater than 1,
- 181 is not a product of 2 smaller natural numbers (it can be divided only by 1 and itself)

Number of factors: 2.

List of factors/divisors: 1, 181.

Parity: 181 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 1 (perfect number is a positive integer that is equal to the sum of its proper divisors).

Number: Prime number: | 174 no | 175 no | 176 no | 177 no | 178 no | 179 yes | 180 no | 181 yes | 182 no | 183 no | 184 no | 185 no | 186 no | 187 no | 188 no |
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