51631224 has 16 divisors (see below), whose sum is σ = 129078120. Its totient is φ = 17210400.

The previous prime is 51631219. The next prime is 51631231. The reversal of 51631224 is 42213615.

51631224 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 2151301 = 51631224 / (5 + 1 + 6 + 3 + 1 + 2 + 2 + 4).

It is a junction number, because it is equal to n+sod(n) for n = 51631194 and 51631203.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1075627 + ... + 1075674.

Almost surely, 2^51631224 is an apocalyptic number.

It is an amenable number.

51631224 is an abundant number, since it is smaller than the sum of its proper divisors (77446896).

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

51631224 is a wasteful number, since it uses less digits than its factorization.

51631224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2151310 (or 2151306 counting only the distinct ones).

The product of its digits is 1440, while the sum is 24.

The square root of 51631224 is about 7185.4870398603. The cubic root of 51631224 is about 372.3666751065.

Adding to 51631224 its reverse (42213615), we get a palindrome (93844839).

The spelling of 51631224 in words is "fifty-one million, six hundred thirty-one thousand, two hundred twenty-four".