81588149239 has 2 divisors, whose sum is σ = 81588149240. Its totient is φ = 81588149238.

The previous prime is 81588149231. The next prime is 81588149263. The reversal of 81588149239 is 93294188518.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81588149239 - 2³ = 81588149231 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81588149231) 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, 40794074619 + 40794074620.

It is an arithmetic number, because the mean of its divisors is an integer number (40794074620).

Almost surely, 2^81588149239 is an apocalyptic number.

81588149239 is a deficient number, since it is larger than the sum of its proper divisors (1).

81588149239 is an equidigital number, since it uses as much as digits as its factorization.

81588149239 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4976640, while the sum is 58.

The spelling of 81588149239 in words is "eighty-one billion, five hundred eighty-eight million, one hundred forty-nine thousand, two hundred thirty-nine".