Numbers / 801

The Number 801

801 is composite: factorization 3^2 × 89. That gives 801 exactly 6 divisors: 1, 3, 9, 89, 267, 801. 801's proper divisors total just 369, 432 short of 801, the deficient case most of 801's neighbors share too. 801 has a digit sum of 9; for 801, the digital root works out to 9. 801: 3, 9 all divide 801 evenly, out of 2-12. 801 is 1100100001 in binary and 321 in hex; as a Roman numeral it's DCCCI.