Numbers / 545

The Number 545

545 is composite: factorization 5 × 109. That gives 545 exactly 4 divisors: 1, 5, 109, 545. 545's proper divisors total just 115, 430 short of 545, the deficient case most of 545's neighbors share too. 545 is also a palindrome, since 545 reads identically forwards and backwards. 545 has a digit sum of 14; for 545, the digital root works out to 5. 545: 5 all divide 545 evenly, out of 2-12. 545 is 1000100001 in binary and 221 in hex; as a Roman numeral it's DXLV.