85117985 has 16 divisors (see below), whose sum is σ = 103789056. Its totient is φ = 67004928.

The previous prime is 85117961. The next prime is 85118003. The reversal of 85117985 is 58971158.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 85117985 - 2²² = 80923681 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 107762 + ... + 108548.

It is an arithmetic number, because the mean of its divisors is an integer number (6486816).

Almost surely, 2^85117985 is an apocalyptic number.

It is an amenable number.

85117985 is a deficient number, since it is larger than the sum of its proper divisors (18671071).

85117985 is a wasteful number, since it uses less digits than its factorization.

85117985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1112.

The product of its digits is 100800, while the sum is 44.

The square root of 85117985 is about 9225.9408734286. The cubic root of 85117985 is about 439.8863084357.

The spelling of 85117985 in words is "eighty-five million, one hundred seventeen thousand, nine hundred eighty-five".