51513506 has 16 divisors (see below), whose sum is σ = 87015168. Its totient is φ = 22659600.

The previous prime is 51513433. The next prime is 51513533. The reversal of 51513506 is 60531515.

51513506 = 206² + 207² + ... + 546².

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37085 + ... + 38448.

It is an arithmetic number, because the mean of its divisors is an integer number (5438448).

Almost surely, 2^51513506 is an apocalyptic number.

51513506 is a deficient number, since it is larger than the sum of its proper divisors (35501662).

51513506 is a wasteful number, since it uses less digits than its factorization.

51513506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75577.

The product of its (nonzero) digits is 2250, while the sum is 26.

The square root of 51513506 is about 7177.2909931255. The cubic root of 51513506 is about 372.0834639484.

Subtracting 51513506 from its reverse (60531515), we obtain a square (9018009 = 3003²).

The spelling of 51513506 in words is "fifty-one million, five hundred thirteen thousand, five hundred six".