85631091 has 32 divisors (see below), whose sum is σ = 148796928. Its totient is φ = 42508800.

The previous prime is 85631059. The next prime is 85631107. The reversal of 85631091 is 19013658.

It is not a de Polignac number, because 85631091 - 2⁵ = 85631059 is a prime.

It is not an unprimeable number, because it can be changed into a prime (85631191) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4585 + ... + 13866.

It is an arithmetic number, because the mean of its divisors is an integer number (4649904).

Almost surely, 2^85631091 is an apocalyptic number.

85631091 is a deficient number, since it is larger than the sum of its proper divisors (63165837).

85631091 is a wasteful number, since it uses less digits than its factorization.

85631091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18491.

The product of its (nonzero) digits is 6480, while the sum is 33.

The square root of 85631091 is about 9253.7068788675. The cubic root of 85631091 is about 440.7684419460.

The spelling of 85631091 in words is "eighty-five million, six hundred thirty-one thousand, ninety-one".