Numbers / 571

The Number 571

571 is prime: only 1 and 571 divide it evenly; the next prime after 571 is 577. 571's proper divisors total just 1, 570 short of 571, the deficient case most of 571's neighbors share too. 571 has a digit sum of 13; for 571, the digital root works out to 4. 571 shares no factor with 2-12; 571's own divisors start beyond that range. 571 is 1000111011 in binary and 23B in hex; as a Roman numeral it's DLXXI.