51311012346531 has 12 divisors (see below), whose sum is σ = 84703893397552. Its totient is φ = 29320578483696.

The previous prime is 51311012346481. The next prime is 51311012346551. The reversal of 51311012346531 is 13564321011315.

51311012346531 is a `hidden beast` number, since 5 + 1 + 3 + 110 + 1 + 2 + 3 + 4 + 6 + 531 = 666.

It is not a de Polignac number, because 51311012346531 - 2⁶ = 51311012346467 is a prime.

It is a super-2 number, since 2×51311012346531² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51311012346551) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 407230256656 + ... + 407230256781.

Almost surely, 2^{51311012346531} is an apocalyptic number.

51311012346531 is a deficient number, since it is larger than the sum of its proper divisors (33392881051021).

51311012346531 is a wasteful number, since it uses less digits than its factorization.

51311012346531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 814460513450 (or 814460513447 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

Adding to 51311012346531 its reverse (13564321011315), we get a palindrome (64875333357846).

The spelling of 51311012346531 in words is "fifty-one trillion, three hundred eleven billion, twelve million, three hundred forty-six thousand, five hundred thirty-one".