51381573232631 has 24 divisors (see below), whose sum is σ = 53782485138480. Its totient is φ = 49083755212800.

The previous prime is 51381573232567. The next prime is 51381573232637. The reversal of 51381573232631 is 13623237518315.

It is not a de Polignac number, because 51381573232631 - 2⁶ = 51381573232567 is a prime.

It is a super-2 number, since 2×51381573232631² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51381573232631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51381573232637) 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, 1911432311 + ... + 1911459191.

It is an arithmetic number, because the mean of its divisors is an integer number (2240936880770).

Almost surely, 2^{51381573232631} is an apocalyptic number.

51381573232631 is a deficient number, since it is larger than the sum of its proper divisors (2400911905849).

51381573232631 is a wasteful number, since it uses less digits than its factorization.

51381573232631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31487 (or 31464 counting only the distinct ones).

The product of its digits is 2721600, while the sum is 50.

The spelling of 51381573232631 in words is "fifty-one trillion, three hundred eighty-one billion, five hundred seventy-three million, two hundred thirty-two thousand, six hundred thirty-one".