Number 819 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 819 as a prime number, because it can be written as a product of two smaller natural numbers (check the factors of number 819 below).

Number of factors: 12.

List of factors/divisors: 1, 3, 7, 9, 13, 21, 39, 63, 91, 117, 273, 819.

Parity: 819 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 637 (perfect number is a positive integer that is equal to the sum of its proper divisors).

Number: Prime number: | 812 no | 813 no | 814 no | 815 no | 816 no | 817 no | 818 no | 819 no | 820 no | 821 yes | 822 no | 823 yes | 824 no | 825 no | 826 no |
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