81497343127 has 2 divisors, whose sum is σ = 81497343128. Its totient is φ = 81497343126.

The previous prime is 81497343097. The next prime is 81497343149. The reversal of 81497343127 is 72134379418.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81497343127 - 2¹⁵ = 81497310359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81497343167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40748671563 + 40748671564.

It is an arithmetic number, because the mean of its divisors is an integer number (40748671564).

Almost surely, 2^81497343127 is an apocalyptic number.

81497343127 is a deficient number, since it is larger than the sum of its proper divisors (1).

81497343127 is an equidigital number, since it uses as much as digits as its factorization.

81497343127 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1016064, while the sum is 49.

The spelling of 81497343127 in words is "eighty-one billion, four hundred ninety-seven million, three hundred forty-three thousand, one hundred twenty-seven".