516 = 22 x 3 x 43.
516 is the number of partitions of 32 in which no part occurs only once.
516 is the sum of two distinct powers of 2: 516 = 29 + 22.
The digit 6 occurs in the 516th position in the decimal expansion of pi.
516 are the first three digits in the Dewey Decimal Classification System call numbers for library books in geometry.