Number 139 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 139 as a prime number, because:

- 139 is a natural number greater than 1,
- 139 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, 139.

Parity: 139 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: | 132 no | 133 no | 134 no | 135 no | 136 no | 137 yes | 138 no | 139 yes | 140 no | 141 no | 142 no | 143 no | 144 no | 145 no | 146 no |
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