51518232 has 48 divisors (see below), whose sum is σ = 139992840. Its totient is φ = 17115648.

The previous prime is 51518219. The next prime is 51518261. The reversal of 51518232 is 23281515.

It is a happy number.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 51518196 and 51518205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24403 + ... + 26429.

Almost surely, 2^51518232 is an apocalyptic number.

It is an amenable number.

51518232 is an abundant number, since it is smaller than the sum of its proper divisors (88474608).

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

51518232 is a wasteful number, since it uses less digits than its factorization.

51518232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2392 (or 2385 counting only the distinct ones).

The product of its digits is 2400, while the sum is 27.

The square root of 51518232 is about 7177.6202184289. The cubic root of 51518232 is about 372.0948422762.

Adding to 51518232 its reverse (23281515), we get a palindrome (74799747).

The spelling of 51518232 in words is "fifty-one million, five hundred eighteen thousand, two hundred thirty-two".