51731016931 has 4 divisors (see below), whose sum is σ = 56433836664. Its totient is φ = 47028197200.

The previous prime is 51731016907. The next prime is 51731016937. The reversal of 51731016931 is 13961013715.

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

It is a cyclic number.

It is not a de Polignac number, because 51731016931 - 2⁷ = 51731016803 is a prime.

It is a super-3 number, since 3×51731016931³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51731016937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2351409850 + ... + 2351409871.

It is an arithmetic number, because the mean of its divisors is an integer number (14108459166).

Almost surely, 2^51731016931 is an apocalyptic number.

51731016931 is a deficient number, since it is larger than the sum of its proper divisors (4702819733).

51731016931 is a wasteful number, since it uses less digits than its factorization.

51731016931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4702819732.

The product of its (nonzero) digits is 17010, while the sum is 37.

The spelling of 51731016931 in words is "fifty-one billion, seven hundred thirty-one million, sixteen thousand, nine hundred thirty-one".