Numbers / 611

The Number 611

611 is composite: factorization 13 × 47. That gives 611 exactly 4 divisors: 1, 13, 47, 611. 611's proper divisors total just 61, 550 short of 611, the deficient case most of 611's neighbors share too. 611 has a digit sum of 8; for 611, the digital root works out to 8. 611 shares no factor with 2-12; 611's own divisors start beyond that range. 611 is 1001100011 in binary and 263 in hex; as a Roman numeral it's DCXI.