51615875 has 32 divisors (see below), whose sum is σ = 68789760. Its totient is φ = 38556000.

The previous prime is 51615871. The next prime is 51615881. The reversal of 51615875 is 57851615.

It is a happy number.

It is not a de Polignac number, because 51615875 - 2² = 51615871 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51615871) 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, 244520 + ... + 244730.

It is an arithmetic number, because the mean of its divisors is an integer number (2149680).

Almost surely, 2^51615875 is an apocalyptic number.

51615875 is a deficient number, since it is larger than the sum of its proper divisors (17173885).

51615875 is a wasteful number, since it uses less digits than its factorization.

51615875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348 (or 338 counting only the distinct ones).

The product of its digits is 42000, while the sum is 38.

The square root of 51615875 is about 7184.4189048245. The cubic root of 51615875 is about 372.3297722267.

The spelling of 51615875 in words is "fifty-one million, six hundred fifteen thousand, eight hundred seventy-five".