Numbers / 563

The Number 563

563 is prime: only 1 and 563 divide it evenly; the next prime after 563 is 569. 563's proper divisors total just 1, 562 short of 563, the deficient case most of 563's neighbors share too. 563 has a digit sum of 14; for 563, the digital root works out to 5. 563 shares no factor with 2-12; 563's own divisors start beyond that range. 563 is 1000110011 in binary and 233 in hex; as a Roman numeral it's DLXIII.