85999171 has 2 divisors, whose sum is σ = 85999172. Its totient is φ = 85999170.

The previous prime is 85999091. The next prime is 85999189. The reversal of 85999171 is 17199958.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 85999171 - 2¹¹ = 85997123 is a prime.

It is not a weakly prime, because it can be changed into another prime (85999271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42999585 + 42999586.

It is an arithmetic number, because the mean of its divisors is an integer number (42999586).

Almost surely, 2^85999171 is an apocalyptic number.

85999171 is a deficient number, since it is larger than the sum of its proper divisors (1).

85999171 is an equidigital number, since it uses as much as digits as its factorization.

85999171 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 204120, while the sum is 49.

The square root of 85999171 is about 9273.5737987035. The cubic root of 85999171 is about 441.3990779412.

The spelling of 85999171 in words is "eighty-five million, nine hundred ninety-nine thousand, one hundred seventy-one".