51353865 has 32 divisors (see below), whose sum is σ = 96105600. Its totient is φ = 25945920.

The previous prime is 51353833. The next prime is 51353881. The reversal of 51353865 is 56835315.

It is not a de Polignac number, because 51353865 - 2⁵ = 51353833 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7446 + ... + 12575.

It is an arithmetic number, because the mean of its divisors is an integer number (3003300).

Almost surely, 2^51353865 is an apocalyptic number.

It is an amenable number.

51353865 is a deficient number, since it is larger than the sum of its proper divisors (44751735).

51353865 is a wasteful number, since it uses less digits than its factorization.

51353865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20054 (or 20048 counting only the distinct ones).

The product of its digits is 54000, while the sum is 36.

The square root of 51353865 is about 7166.1611061991. The cubic root of 51353865 is about 371.6987024430.

The spelling of 51353865 in words is "fifty-one million, three hundred fifty-three thousand, eight hundred sixty-five".