51515636 has 12 divisors (see below), whose sum is σ = 90215328. Its totient is φ = 25739832.

The previous prime is 51515623. The next prime is 51515641. The reversal of 51515636 is 63651515.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3545 + ... + 10751.

It is an arithmetic number, because the mean of its divisors is an integer number (7517944).

Almost surely, 2^51515636 is an apocalyptic number.

It is an amenable number.

51515636 is a deficient number, since it is larger than the sum of its proper divisors (38699692).

51515636 is a wasteful number, since it uses less digits than its factorization.

51515636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8998 (or 8996 counting only the distinct ones).

The product of its digits is 13500, while the sum is 32.

The square root of 51515636 is about 7177.4393762678. The cubic root of 51515636 is about 372.0885922272.

The spelling of 51515636 in words is "fifty-one million, five hundred fifteen thousand, six hundred thirty-six".