Numbers / 53

The Number 53

53 is prime: only 1 and 53 divide it evenly; the next prime after 53 is 59. 53's proper divisors total just 1, 52 short of 53, the deficient case most of 53's neighbors share too. 53 has a digit sum of 8; for 53, the digital root works out to 8. 53 shares no factor with 2-12; 53's own divisors start beyond that range. 53 is 110101 in binary and 35 in hex; as a Roman numeral it's LIII.