51731058315731 has 2 divisors, whose sum is σ = 51731058315732. Its totient is φ = 51731058315730.

The previous prime is 51731058315683. The next prime is 51731058315767. The reversal of 51731058315731 is 13751385013715.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51731058315731 is a prime.

It is a super-2 number, since 2×51731058315731² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51731058315731.

It is not a weakly prime, because it can be changed into another prime (51731058315031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25865529157865 + 25865529157866.

It is an arithmetic number, because the mean of its divisors is an integer number (25865529157866).

Almost surely, 2^{51731058315731} is an apocalyptic number.

51731058315731 is a deficient number, since it is larger than the sum of its proper divisors (1).

51731058315731 is an equidigital number, since it uses as much as digits as its factorization.

51731058315731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1323000, while the sum is 50.

The spelling of 51731058315731 in words is "fifty-one trillion, seven hundred thirty-one billion, fifty-eight million, three hundred fifteen thousand, seven hundred thirty-one".