Numbers / 525

The Number 525

525 is composite: factorization 3 × 5^2 × 7. That gives 525 exactly 12 divisors: 1, 3, 5, 7, 15, 21, 25, 35, 75, 105, 175, 525. 525's proper divisors total just 467, 58 short of 525, the deficient case most of 525's neighbors share too. 525 is also a palindrome, since 525 reads identically forwards and backwards. 525 has a digit sum of 12; for 525, the digital root works out to 3. 525: 3, 5, 7 all divide 525 evenly, out of 2-12. 525 is 1000001101 in binary and 20D in hex; as a Roman numeral it's DXXV.