Numbers / 697

The Number 697

697 is composite: factorization 17 × 41. That gives 697 exactly 4 divisors: 1, 17, 41, 697. 697's proper divisors total just 59, 638 short of 697, the deficient case most of 697's neighbors share too. 697 has a digit sum of 22; for 697, the digital root works out to 4. 697 shares no factor with 2-12; 697's own divisors start beyond that range. 697 is 1010111001 in binary and 2B9 in hex; as a Roman numeral it's DCXCVII.