51275231631 has 80 divisors (see below), whose sum is σ = 87290058240. Its totient is φ = 29755978560.

The previous prime is 51275231617. The next prime is 51275231641. The reversal of 51275231631 is 13613257215.

51275231631 is a `hidden beast` number, since 5 + 12 + 7 + 5 + 2 + 3 + 1 + 631 = 666.

It is not a de Polignac number, because 51275231631 - 2²⁹ = 50738360719 is a prime.

It is a super-4 number, since 4×51275231631⁴ (a number of 44 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51275231641) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1704640 + ... + 1734458.

It is an arithmetic number, because the mean of its divisors is an integer number (1091125728).

Almost surely, 2^51275231631 is an apocalyptic number.

51275231631 is a deficient number, since it is larger than the sum of its proper divisors (36014826609).

51275231631 is a wasteful number, since it uses less digits than its factorization.

51275231631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29938 (or 29929 counting only the distinct ones).

The product of its digits is 37800, while the sum is 36.

Adding to 51275231631 its reverse (13613257215), we get a palindrome (64888488846).

The spelling of 51275231631 in words is "fifty-one billion, two hundred seventy-five million, two hundred thirty-one thousand, six hundred thirty-one".