Numbers / 133

The Number 133

133 is composite: factorization 7 × 19. That gives 133 exactly 4 divisors: 1, 7, 19, 133. 133's proper divisors total just 27, 106 short of 133, the deficient case most of 133's neighbors share too. 133 has a digit sum of 7; for 133, the digital root works out to 7. 133: 7 all divide 133 evenly, out of 2-12. 133 is 10000101 in binary and 85 in hex; as a Roman numeral it's CXXXIII.