51315983231 has 8 divisors (see below), whose sum is σ = 51636604800. Its totient is φ = 50996252160.

The previous prime is 51315983219. The next prime is 51315983273. The reversal of 51315983231 is 13238951315.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51315983231 - 2¹⁸ = 51315721087 is a prime.

It is a super-2 number, since 2×51315983231² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51315983431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106826 + ... + 337703.

It is an arithmetic number, because the mean of its divisors is an integer number (6454575600).

Almost surely, 2^51315983231 is an apocalyptic number.

51315983231 is a deficient number, since it is larger than the sum of its proper divisors (320621569).

51315983231 is a wasteful number, since it uses less digits than its factorization.

51315983231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 445249.

The product of its digits is 97200, while the sum is 41.

The spelling of 51315983231 in words is "fifty-one billion, three hundred fifteen million, nine hundred eighty-three thousand, two hundred thirty-one".