51231431243656 has 64 divisors (see below), whose sum is σ = 103199290997760. Its totient is φ = 23756140800000.

The previous prime is 51231431243617. The next prime is 51231431243683. The reversal of 51231431243656 is 65634213413215.

It is a happy number.

51231431243656 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×51231431243656³ (a number of 42 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15917481 + ... + 18863431.

It is an arithmetic number, because the mean of its divisors is an integer number (1612488921840).

Almost surely, 2^{51231431243656} is an apocalyptic number.

It is an amenable number.

51231431243656 is an abundant number, since it is smaller than the sum of its proper divisors (51967859754104).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51231431243656 is a wasteful number, since it uses less digits than its factorization.

51231431243656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2947846 (or 2947842 counting only the distinct ones).

The product of its digits is 1555200, while the sum is 46.

The spelling of 51231431243656 in words is "fifty-one trillion, two hundred thirty-one billion, four hundred thirty-one million, two hundred forty-three thousand, six hundred fifty-six".