85218985 has 4 divisors (see below), whose sum is σ = 102262788. Its totient is φ = 68175184.

The previous prime is 85218983. The next prime is 85218989. The reversal of 85218985 is 58981258.

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

It can be written as a sum of positive squares in 2 ways, for example, as 28472896 + 56746089 = 5336^2 + 7533^2 .

It is a cyclic number.

It is not a de Polignac number, because 85218985 - 2¹ = 85218983 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85218983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8521894 + ... + 8521903.

It is an arithmetic number, because the mean of its divisors is an integer number (25565697).

Almost surely, 2^85218985 is an apocalyptic number.

It is an amenable number.

85218985 is a deficient number, since it is larger than the sum of its proper divisors (17043803).

85218985 is a wasteful number, since it uses less digits than its factorization.

85218985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17043802.

The product of its digits is 230400, while the sum is 46.

The square root of 85218985 is about 9231.4129471062. The cubic root of 85218985 is about 440.0602276371.

The spelling of 85218985 in words is "eighty-five million, two hundred eighteen thousand, nine hundred eighty-five".