85917031 has 16 divisors (see below), whose sum is σ = 96132960. Its totient is φ = 76308480.

The previous prime is 85917011. The next prime is 85917047. The reversal of 85917031 is 13071958.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 85917031 - 2²⁵ = 52362599 is a prime.

It is a super-2 number, since 2×85917031² = 14763472431709922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85917011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 148615 + ... + 149191.

It is an arithmetic number, because the mean of its divisors is an integer number (6008310).

Almost surely, 2^85917031 is an apocalyptic number.

85917031 is a deficient number, since it is larger than the sum of its proper divisors (10215929).

85917031 is a wasteful number, since it uses less digits than its factorization.

85917031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1074.

The product of its (nonzero) digits is 7560, while the sum is 34.

The square root of 85917031 is about 9269.1440273630. The cubic root of 85917031 is about 441.2585026730.

Adding to 85917031 its reverse (13071958), we get a palindrome (98988989).

The spelling of 85917031 in words is "eighty-five million, nine hundred seventeen thousand, thirty-one".