81792522491 has 2 divisors, whose sum is σ = 81792522492. Its totient is φ = 81792522490.

The previous prime is 81792522443. The next prime is 81792522503. The reversal of 81792522491 is 19422529718.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81792522491 is a prime.

It is not a weakly prime, because it can be changed into another prime (81792512491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40896261245 + 40896261246.

It is an arithmetic number, because the mean of its divisors is an integer number (40896261246).

Almost surely, 2^81792522491 is an apocalyptic number.

81792522491 is a deficient number, since it is larger than the sum of its proper divisors (1).

81792522491 is an equidigital number, since it uses as much as digits as its factorization.

81792522491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 725760, while the sum is 50.

The spelling of 81792522491 in words is "eighty-one billion, seven hundred ninety-two million, five hundred twenty-two thousand, four hundred ninety-one".