51631131541 has 4 divisors (see below), whose sum is σ = 56324870784. Its totient is φ = 46937392300.

The previous prime is 51631131523. The next prime is 51631131551. The reversal of 51631131541 is 14513113615.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51631131541 - 2⁵ = 51631131509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51631131551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2346869605 + ... + 2346869626.

It is an arithmetic number, because the mean of its divisors is an integer number (14081217696).

Almost surely, 2^51631131541 is an apocalyptic number.

It is an amenable number.

51631131541 is a deficient number, since it is larger than the sum of its proper divisors (4693739243).

51631131541 is a wasteful number, since it uses less digits than its factorization.

51631131541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4693739242.

The product of its digits is 5400, while the sum is 31.

The spelling of 51631131541 in words is "fifty-one billion, six hundred thirty-one million, one hundred thirty-one thousand, five hundred forty-one".