Numbers / 29

The Number 29

29 is prime: only 1 and 29 divide it evenly; the next prime after 29 is 31. 29's proper divisors total just 1, 28 short of 29, the deficient case most of 29's neighbors share too. 29 has a digit sum of 11; for 29, the digital root works out to 2. 29 shares no factor with 2-12; 29's own divisors start beyond that range. 29 is 11101 in binary and 1D in hex; as a Roman numeral it's XXIX.