51988431913 has 24 divisors (see below), whose sum is σ = 57519604224. Its totient is φ = 46597636800.

The previous prime is 51988431907. The next prime is 51988431931. The reversal of 51988431913 is 31913488915.

It is a de Polignac number, because none of the positive numbers 2^k-51988431913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51988431413) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 130953031 + ... + 130953427.

It is an arithmetic number, because the mean of its divisors is an integer number (2396650176).

Almost surely, 2^51988431913 is an apocalyptic number.

It is an amenable number.

51988431913 is a deficient number, since it is larger than the sum of its proper divisors (5531172311).

51988431913 is a wasteful number, since it uses less digits than its factorization.

51988431913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1153 (or 756 counting only the distinct ones).

The product of its digits is 933120, while the sum is 52.

The spelling of 51988431913 in words is "fifty-one billion, nine hundred eighty-eight million, four hundred thirty-one thousand, nine hundred thirteen".