Factors / Factors of 509

Factors of 509

1, 509

509 is prime: only factor pair is (1, 509), confirmed by trial division up to √509 ≈ 22.6 turning up nothing else. 509's full pair list is (1, 509), for 2 divisors in total. 509's divisors other than 509 itself sum to just 1, 508 below 509: the common deficient case. 509 is odd, digit sum 14 for 509; none of 2-12 divide 509 evenly. 509 has 2 divisors; 508 has 6 and 510 has 16, so 510 wins here. 509 divided by its largest divisor, 1, gives 509.