Number 71 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 71 as a prime number, because:

- 71 is a natural number greater than 1,
- 71 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, 71.

Parity: 71 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: | 64 no | 65 no | 66 no | 67 yes | 68 no | 69 no | 70 no | 71 yes | 72 no | 73 yes | 74 no | 75 no | 76 no | 77 no | 78 no |
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