51395007931 has 2 divisors, whose sum is σ = 51395007932. Its totient is φ = 51395007930.

The previous prime is 51395007919. The next prime is 51395007947. The reversal of 51395007931 is 13970059315.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51395007931 - 2³¹ = 49247524283 is a prime.

It is a super-2 number, since 2×51395007931² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51395007991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25697503965 + 25697503966.

It is an arithmetic number, because the mean of its divisors is an integer number (25697503966).

Almost surely, 2^51395007931 is an apocalyptic number.

51395007931 is a deficient number, since it is larger than the sum of its proper divisors (1).

51395007931 is an equidigital number, since it uses as much as digits as its factorization.

51395007931 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 127575, while the sum is 43.

The spelling of 51395007931 in words is "fifty-one billion, three hundred ninety-five million, seven thousand, nine hundred thirty-one".