51696865 has 16 divisors (see below), whose sum is σ = 68690880. Its totient is φ = 37033920.

The previous prime is 51696857. The next prime is 51696877. The reversal of 51696865 is 56869615.

It is not a de Polignac number, because 51696865 - 2³ = 51696857 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, 3330 + ... + 10699.

It is an arithmetic number, because the mean of its divisors is an integer number (4293180).

Almost surely, 2^51696865 is an apocalyptic number.

51696865 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

51696865 is a deficient number, since it is larger than the sum of its proper divisors (16994015).

51696865 is a wasteful number, since it uses less digits than its factorization.

51696865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14112.

The product of its digits is 388800, while the sum is 46.

The square root of 51696865 is about 7190.0531986905. The cubic root of 51696865 is about 372.5244102136.

The spelling of 51696865 in words is "fifty-one million, six hundred ninety-six thousand, eight hundred sixty-five".