51522861 has 24 divisors (see below), whose sum is σ = 74991936. Its totient is φ = 31449600.

The previous prime is 51522853. The next prime is 51522881. The reversal of 51522861 is 16822515.

It is not a de Polignac number, because 51522861 - 2³ = 51522853 is a prime.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51522841) 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, 76221 + ... + 76893.

It is an arithmetic number, because the mean of its divisors is an integer number (3124664).

Almost surely, 2^51522861 is an apocalyptic number.

It is an amenable number.

51522861 is a deficient number, since it is larger than the sum of its proper divisors (23469075).

51522861 is a wasteful number, since it uses less digits than its factorization.

51522861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 853 (or 840 counting only the distinct ones).

The product of its digits is 4800, while the sum is 30.

The square root of 51522861 is about 7177.9426718246. The cubic root of 51522861 is about 372.1059863921.

The spelling of 51522861 in words is "fifty-one million, five hundred twenty-two thousand, eight hundred sixty-one".