51525621 has 12 divisors (see below), whose sum is σ = 85058272. Its totient is φ = 29443176.

The previous prime is 51525599. The next prime is 51525631. The reversal of 51525621 is 12652515.

51525621 is a `hidden beast` number, since 5 + 15 + 25 + 621 = 666.

It is not a de Polignac number, because 51525621 - 2⁶ = 51525557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51525631) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 408871 + ... + 408996.

Almost surely, 2^51525621 is an apocalyptic number.

It is an amenable number.

51525621 is a deficient number, since it is larger than the sum of its proper divisors (33532651).

51525621 is a wasteful number, since it uses less digits than its factorization.

51525621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 817880 (or 817877 counting only the distinct ones).

The product of its digits is 3000, while the sum is 27.

The square root of 51525621 is about 7178.1349248952. The cubic root of 51525621 is about 372.1126306542.

The spelling of 51525621 in words is "fifty-one million, five hundred twenty-five thousand, six hundred twenty-one".