51656915 has 16 divisors (see below), whose sum is σ = 66086400. Its totient is φ = 38649312.

The previous prime is 51656909. The next prime is 51656947. The reversal of 51656915 is 51965615.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 51656915 - 2⁶ = 51656851 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4064 + ... + 10946.

It is an arithmetic number, because the mean of its divisors is an integer number (4130400).

Almost surely, 2^51656915 is an apocalyptic number.

51656915 is a deficient number, since it is larger than the sum of its proper divisors (14429485).

51656915 is a wasteful number, since it uses less digits than its factorization.

51656915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6986.

The product of its digits is 40500, while the sum is 38.

The square root of 51656915 is about 7187.2745182023. The cubic root of 51656915 is about 372.4284264088.

The spelling of 51656915 in words is "fifty-one million, six hundred fifty-six thousand, nine hundred fifteen".