Numbers / 501

The Number 501

501 is composite: factorization 3 × 167. That gives 501 exactly 4 divisors: 1, 3, 167, 501. 501's proper divisors total just 171, 330 short of 501, the deficient case most of 501's neighbors share too. 501 has a digit sum of 6; for 501, the digital root works out to 6. 501: 3 all divide 501 evenly, out of 2-12. 501 is 111110101 in binary and 1F5 in hex; as a Roman numeral it's DI.