Numbers / 47

The Number 47

47 is prime: only 1 and 47 divide it evenly; the next prime after 47 is 53. 47's proper divisors total just 1, 46 short of 47, the deficient case most of 47's neighbors share too. 47 has a digit sum of 11; for 47, the digital root works out to 2. 47 shares no factor with 2-12; 47's own divisors start beyond that range. 47 is 101111 in binary and 2F in hex; as a Roman numeral it's XLVII.