51643875 has 32 divisors (see below), whose sum is σ = 91001664. Its totient is φ = 25920000.

The previous prime is 51643859. The next prime is 51643877. The reversal of 51643875 is 57834615.

It is not a de Polignac number, because 51643875 - 2⁴ = 51643859 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51643877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2325 + ... + 10425.

It is an arithmetic number, because the mean of its divisors is an integer number (2843802).

Almost surely, 2^51643875 is an apocalyptic number.

51643875 is a deficient number, since it is larger than the sum of its proper divisors (39357789).

51643875 is a wasteful number, since it uses less digits than its factorization.

51643875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8136 (or 8126 counting only the distinct ones).

The product of its digits is 100800, while the sum is 39.

The square root of 51643875 is about 7186.3673020519. The cubic root of 51643875 is about 372.3970858136.

The spelling of 51643875 in words is "fifty-one million, six hundred forty-three thousand, eight hundred seventy-five".