51631624 has 16 divisors (see below), whose sum is σ = 105610320. Its totient is φ = 23468880.

The previous prime is 51631609. The next prime is 51631627. The reversal of 51631624 is 42613615.

It is a junction number, because it is equal to n+sod(n) for n = 51631592 and 51631601.

It is not an unprimeable number, because it can be changed into a prime (51631627) 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 3 ways as a sum of consecutive naturals, for example, 293274 + ... + 293449.

It is an arithmetic number, because the mean of its divisors is an integer number (6600645).

Almost surely, 2^51631624 is an apocalyptic number.

It is an amenable number.

51631624 is an abundant number, since it is smaller than the sum of its proper divisors (53978696).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51631624 is a wasteful number, since it uses less digits than its factorization.

51631624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 586740 (or 586736 counting only the distinct ones).

The product of its digits is 4320, while the sum is 28.

The square root of 51631624 is about 7185.5148736886. The cubic root of 51631624 is about 372.3676367099.

Subtracting from 51631624 its reverse (42613615), we obtain a square (9018009 = 3003²).

The spelling of 51631624 in words is "fifty-one million, six hundred thirty-one thousand, six hundred twenty-four".