Numbers / 791

The Number 791

791 is composite: factorization 7 × 113. That gives 791 exactly 4 divisors: 1, 7, 113, 791. 791's proper divisors total just 121, 670 short of 791, the deficient case most of 791's neighbors share too. 791 has a digit sum of 17; for 791, the digital root works out to 8. 791: 7 all divide 791 evenly, out of 2-12. 791 is 1100010111 in binary and 317 in hex; as a Roman numeral it's DCCXCI.