85199991 has 8 divisors (see below), whose sum is σ = 115743600. Its totient is φ = 55728192.

The previous prime is 85199987. The next prime is 85199993. The reversal of 85199991 is 19999158.

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

It is not a de Polignac number, because 85199991 - 2² = 85199987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85199993) 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, 267766 + ... + 268083.

It is an arithmetic number, because the mean of its divisors is an integer number (14467950).

Almost surely, 2^85199991 is an apocalyptic number.

85199991 is a deficient number, since it is larger than the sum of its proper divisors (30543609).

85199991 is a wasteful number, since it uses less digits than its factorization.

85199991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 535905.

The product of its digits is 262440, while the sum is 51.

The square root of 85199991 is about 9230.3841198511. The cubic root of 85199991 is about 440.0275309908.

The spelling of 85199991 in words is "eighty-five million, one hundred ninety-nine thousand, nine hundred ninety-one".