86609731 has 4 divisors (see below), whose sum is σ = 93272032. Its totient is φ = 79947432.

The previous prime is 86609723. The next prime is 86609737. The reversal of 86609731 is 13790668.

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

It is a cyclic number.

It is not a de Polignac number, because 86609731 - 2³ = 86609723 is a prime.

It is a super-2 number, since 2×86609731² = 15002491007784722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (86609737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3331131 + ... + 3331156.

It is an arithmetic number, because the mean of its divisors is an integer number (23318008).

Almost surely, 2^86609731 is an apocalyptic number.

86609731 is a deficient number, since it is larger than the sum of its proper divisors (6662301).

86609731 is a wasteful number, since it uses less digits than its factorization.

86609731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6662300.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 86609731 is about 9306.4349242876. The cubic root of 86609731 is about 442.4412017164.

The spelling of 86609731 in words is "eighty-six million, six hundred nine thousand, seven hundred thirty-one".