85121618 has 8 divisors (see below), whose sum is σ = 135193212. Its totient is φ = 40057216.

The previous prime is 85121609. The next prime is 85121651. The reversal of 85121618 is 81612158.

It can be written as a sum of positive squares in 2 ways, for example, as 84695209 + 426409 = 9203^2 + 653^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon 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, 1251755 + ... + 1251822.

Almost surely, 2^85121618 is an apocalyptic number.

85121618 is a deficient number, since it is larger than the sum of its proper divisors (50071594).

85121618 is a wasteful number, since it uses less digits than its factorization.

85121618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2503596.

The product of its digits is 3840, while the sum is 32.

The square root of 85121618 is about 9226.1377618156. The cubic root of 85121618 is about 439.8925667457.

The spelling of 85121618 in words is "eighty-five million, one hundred twenty-one thousand, six hundred eighteen".