51157315731 has 16 divisors (see below), whose sum is σ = 70752150656. Its totient is φ = 32855409216.

The previous prime is 51157315711. The next prime is 51157315733. The reversal of 51157315731 is 13751375115.

It is not a de Polignac number, because 51157315731 - 2⁶ = 51157315667 is a prime.

It is a super-2 number, since 2×51157315731² (a number of 22 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 51157315731.

It is not an unprimeable number, because it can be changed into a prime (51157315733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2706805 + ... + 2725638.

It is an arithmetic number, because the mean of its divisors is an integer number (4422009416).

Almost surely, 2^51157315731 is an apocalyptic number.

51157315731 is a deficient number, since it is larger than the sum of its proper divisors (19594834925).

51157315731 is a wasteful number, since it uses less digits than its factorization.

51157315731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5432562.

The product of its digits is 55125, while the sum is 39.

The spelling of 51157315731 in words is "fifty-one billion, one hundred fifty-seven million, three hundred fifteen thousand, seven hundred thirty-one".