51993905831 has 12 divisors (see below), whose sum is σ = 60509492280. Its totient is φ = 44546468400.

The previous prime is 51993905807. The next prime is 51993905851. The reversal of 51993905831 is 13850939915.

It is not a de Polignac number, because 51993905831 - 2⁶ = 51993905767 is a prime.

It is a super-2 number, since 2×51993905831² (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 (51993905851) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 122645 + ... + 345006.

It is an arithmetic number, because the mean of its divisors is an integer number (5042457690).

Almost surely, 2^51993905831 is an apocalyptic number.

51993905831 is a deficient number, since it is larger than the sum of its proper divisors (8515586449).

51993905831 is a wasteful number, since it uses less digits than its factorization.

51993905831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 469934 (or 469927 counting only the distinct ones).

The product of its (nonzero) digits is 1312200, while the sum is 53.

The spelling of 51993905831 in words is "fifty-one billion, nine hundred ninety-three million, nine hundred five thousand, eight hundred thirty-one".