Numbers / 159

The Number 159

159 is composite: factorization 3 × 53. That gives 159 exactly 4 divisors: 1, 3, 53, 159. 159's proper divisors total just 57, 102 short of 159, the deficient case most of 159's neighbors share too. 159 has a digit sum of 15; for 159, the digital root works out to 6. 159: 3 all divide 159 evenly, out of 2-12. 159 is 10011111 in binary and 9F in hex; as a Roman numeral it's CLIX.