51531131320 has 32 divisors (see below), whose sum is σ = 115983951120. Its totient is φ = 20605536000.

The previous prime is 51531131263. The next prime is 51531131381. The reversal of 51531131320 is 2313113515.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94602 + ... + 334681.

Almost surely, 2^51531131320 is an apocalyptic number.

It is an amenable number.

51531131320 is an abundant number, since it is smaller than the sum of its proper divisors (64452819800).

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

51531131320 is a wasteful number, since it uses less digits than its factorization.

51531131320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432295 (or 432291 counting only the distinct ones).

The product of its (nonzero) digits is 1350, while the sum is 25.

Adding to 51531131320 its reverse (2313113515), we get a palindrome (53844244835).

The spelling of 51531131320 in words is "fifty-one billion, five hundred thirty-one million, one hundred thirty-one thousand, three hundred twenty".