81522872539 has 2 divisors, whose sum is σ = 81522872540. Its totient is φ = 81522872538.

The previous prime is 81522872527. The next prime is 81522872603. The reversal of 81522872539 is 93527822518.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81522872539 - 2⁵ = 81522872507 is a prime.

It is not a weakly prime, because it can be changed into another prime (81522372539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40761436269 + 40761436270.

It is an arithmetic number, because the mean of its divisors is an integer number (40761436270).

Almost surely, 2^81522872539 is an apocalyptic number.

81522872539 is a deficient number, since it is larger than the sum of its proper divisors (1).

81522872539 is an equidigital number, since it uses as much as digits as its factorization.

81522872539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2419200, while the sum is 52.

The spelling of 81522872539 in words is "eighty-one billion, five hundred twenty-two million, eight hundred seventy-two thousand, five hundred thirty-nine".