85391018 has 4 divisors (see below), whose sum is σ = 128086530. Its totient is φ = 42695508.

The previous prime is 85391011. The next prime is 85391023. The reversal of 85391018 is 81019358.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 53772889 + 31618129 = 7333^2 + 5623^2 .

It is not an unprimeable number, because it can be changed into a prime (85391011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21347753 + ... + 21347756.

Almost surely, 2^85391018 is an apocalyptic number.

85391018 is a deficient number, since it is larger than the sum of its proper divisors (42695512).

85391018 is a wasteful number, since it uses less digits than its factorization.

85391018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42695511.

The product of its (nonzero) digits is 8640, while the sum is 35.

The square root of 85391018 is about 9240.7260537254. The cubic root of 85391018 is about 440.3561475974.

The spelling of 85391018 in words is "eighty-five million, three hundred ninety-one thousand, eighteen".