51236865 has 24 divisors (see below), whose sum is σ = 90879360. Its totient is φ = 26689824.

The previous prime is 51236833. The next prime is 51236869. The reversal of 51236865 is 56863215.

It is not a de Polignac number, because 51236865 - 2⁵ = 51236833 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51236869) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11305 + ... + 15174.

It is an arithmetic number, because the mean of its divisors is an integer number (3786640).

Almost surely, 2^51236865 is an apocalyptic number.

It is an amenable number.

51236865 is a deficient number, since it is larger than the sum of its proper divisors (39642495).

51236865 is a wasteful number, since it uses less digits than its factorization.

51236865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26533 (or 26530 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 51236865 is about 7157.9930846572. The cubic root of 51236865 is about 371.4162062311.

The spelling of 51236865 in words is "fifty-one million, two hundred thirty-six thousand, eight hundred sixty-five".