81392127631 has 2 divisors, whose sum is σ = 81392127632. Its totient is φ = 81392127630.

The previous prime is 81392127617. The next prime is 81392127653. The reversal of 81392127631 is 13672129318.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81392127631 - 2¹⁵ = 81392094863 is a prime.

It is a super-2 number, since 2×81392127631² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81392127601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40696063815 + 40696063816.

It is an arithmetic number, because the mean of its divisors is an integer number (40696063816).

Almost surely, 2^81392127631 is an apocalyptic number.

81392127631 is a deficient number, since it is larger than the sum of its proper divisors (1).

81392127631 is an equidigital number, since it uses as much as digits as its factorization.

81392127631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 43.

The spelling of 81392127631 in words is "eighty-one billion, three hundred ninety-two million, one hundred twenty-seven thousand, six hundred thirty-one".