85189999 has 8 divisors (see below), whose sum is σ = 89894880. Its totient is φ = 80568576.

The previous prime is 85189987. The next prime is 85190033. The reversal of 85189999 is 99998158.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 85189999 - 2⁵ = 85189967 is a prime.

It is a Duffinian number.

85189999 is a modest number, since divided by 9999 gives 8518 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85189919) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18762 + ... + 22855.

It is an arithmetic number, because the mean of its divisors is an integer number (11236860).

Almost surely, 2^85189999 is an apocalyptic number.

85189999 is a gapful number since it is divisible by the number (89) formed by its first and last digit.

85189999 is a deficient number, since it is larger than the sum of its proper divisors (4704881).

85189999 is a wasteful number, since it uses less digits than its factorization.

85189999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41729.

The product of its digits is 2099520, while the sum is 58.

The square root of 85189999 is about 9229.8428480663. The cubic root of 85189999 is about 440.0103286143.

The spelling of 85189999 in words is "eighty-five million, one hundred eighty-nine thousand, nine hundred ninety-nine".