85558831 has 2 divisors, whose sum is σ = 85558832. Its totient is φ = 85558830.

The previous prime is 85558819. The next prime is 85558861. The reversal of 85558831 is 13885558.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85558831 - 2²⁵ = 52004399 is a prime.

It is a super-2 number, since 2×85558831² = 14640627124173122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85558861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42779415 + 42779416.

It is an arithmetic number, because the mean of its divisors is an integer number (42779416).

Almost surely, 2^85558831 is an apocalyptic number.

85558831 is a deficient number, since it is larger than the sum of its proper divisors (1).

85558831 is an equidigital number, since it uses as much as digits as its factorization.

85558831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 192000, while the sum is 43.

The square root of 85558831 is about 9249.8016735495. The cubic root of 85558831 is about 440.6444258894.

The spelling of 85558831 in words is "eighty-five million, five hundred fifty-eight thousand, eight hundred thirty-one".