51913988831 has 4 divisors (see below), whose sum is σ = 53588633664. Its totient is φ = 50239344000.

The previous prime is 51913988783. The next prime is 51913988851. The reversal of 51913988831 is 13888931915.

51913988831 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 51913988831 - 2⁶ = 51913988767 is a prime.

It is a super-2 number, since 2×51913988831² (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 (51913988851) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 837322370 + ... + 837322431.

It is an arithmetic number, because the mean of its divisors is an integer number (13397158416).

Almost surely, 2^51913988831 is an apocalyptic number.

51913988831 is a deficient number, since it is larger than the sum of its proper divisors (1674644833).

51913988831 is a wasteful number, since it uses less digits than its factorization.

51913988831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1674644832.

The product of its digits is 1866240, while the sum is 56.

The spelling of 51913988831 in words is "fifty-one billion, nine hundred thirteen million, nine hundred eighty-eight thousand, eight hundred thirty-one".