85391023 has 2 divisors, whose sum is σ = 85391024. Its totient is φ = 85391022.

The previous prime is 85391011. The next prime is 85391027. The reversal of 85391023 is 32019358.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 85391023 - 2⁹ = 85390511 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85391027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42695511 + 42695512.

It is an arithmetic number, because the mean of its divisors is an integer number (42695512).

Almost surely, 2^85391023 is an apocalyptic number.

85391023 is a deficient number, since it is larger than the sum of its proper divisors (1).

85391023 is an equidigital number, since it uses as much as digits as its factorization.

85391023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 85391023 is about 9240.7263242669. The cubic root of 85391023 is about 440.3561561923.

The spelling of 85391023 in words is "eighty-five million, three hundred ninety-one thousand, twenty-three".