51591324 has 12 divisors (see below), whose sum is σ = 120379784. Its totient is φ = 17197104.

The previous prime is 51591317. The next prime is 51591343. The reversal of 51591324 is 42319515.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 51591291 and 51591300.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2149627 + ... + 2149650.

Almost surely, 2^51591324 is an apocalyptic number.

It is an amenable number.

51591324 is an abundant number, since it is smaller than the sum of its proper divisors (68788460).

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

51591324 is a wasteful number, since it uses less digits than its factorization.

51591324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4299284 (or 4299282 counting only the distinct ones).

The product of its digits is 5400, while the sum is 30.

The square root of 51591324 is about 7182.7100735029. The cubic root of 51591324 is about 372.2707301979.

It can be divided in two parts, 51591 and 324, that added together give a palindrome (51915).

The spelling of 51591324 in words is "fifty-one million, five hundred ninety-one thousand, three hundred twenty-four".