85999189 has 2 divisors, whose sum is σ = 85999190. Its totient is φ = 85999188.

The previous prime is 85999171. The next prime is 85999201. The reversal of 85999189 is 98199958.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78464164 + 7535025 = 8858^2 + 2745^2 .

It is a cyclic number.

It is not a de Polignac number, because 85999189 - 2¹¹ = 85997141 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85990189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42999594 + 42999595.

It is an arithmetic number, because the mean of its divisors is an integer number (42999595).

Almost surely, 2^85999189 is an apocalyptic number.

It is an amenable number.

85999189 is a deficient number, since it is larger than the sum of its proper divisors (1).

85999189 is an equidigital number, since it uses as much as digits as its factorization.

85999189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2099520, while the sum is 58.

The square root of 85999189 is about 9273.5747692031. The cubic root of 85999189 is about 441.3991087367.

The spelling of 85999189 in words is "eighty-five million, nine hundred ninety-nine thousand, one hundred eighty-nine".