Numbers / 49

The Number 49

49 is composite: factorization 7^2. That gives 49 exactly 3 divisors: 1, 7, 49. 49's proper divisors total just 8, 41 short of 49, the deficient case most of 49's neighbors share too. 49 is also a perfect square, since 7² = 49. 49 has a digit sum of 13; for 49, the digital root works out to 4. 49: 7 all divide 49 evenly, out of 2-12. 49 is 110001 in binary and 31 in hex; as a Roman numeral it's XLIX.