85128185 has 4 divisors (see below), whose sum is σ = 102153828. Its totient is φ = 68102544.

The previous prime is 85128179. The next prime is 85128191. The reversal of 85128185 is 58182158.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58182158 = 2 ⋅29091079.

It is an interprime number because it is at equal distance from previous prime (85128179) and next prime (85128191).

It can be written as a sum of positive squares in 2 ways, for example, as 61905424 + 23222761 = 7868^2 + 4819^2 .

It is a cyclic number.

It is not a de Polignac number, because 85128185 - 2⁸ = 85127929 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8512814 + ... + 8512823.

It is an arithmetic number, because the mean of its divisors is an integer number (25538457).

Almost surely, 2^85128185 is an apocalyptic number.

It is an amenable number.

85128185 is a deficient number, since it is larger than the sum of its proper divisors (17025643).

85128185 is a wasteful number, since it uses less digits than its factorization.

85128185 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17025642.

The product of its digits is 25600, while the sum is 38.

The square root of 85128185 is about 9226.4936460174. The cubic root of 85128185 is about 439.9038787965.

The spelling of 85128185 in words is "eighty-five million, one hundred twenty-eight thousand, one hundred eighty-five".