86591 has 4 divisors (see below), whose sum is σ = 87384. Its totient is φ = 85800.

The previous prime is 86587. The next prime is 86599. The reversal of 86591 is 19568.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 86591 - 2² = 86587 is a prime.

It is a Duffinian number.

86591 is a Rhonda number in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86599) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 200 + ... + 461.

It is an arithmetic number, because the mean of its divisors is an integer number (21846).

2⁸⁶⁵⁹¹ is an apocalyptic number.

86591 is a deficient number, since it is larger than the sum of its proper divisors (793).

86591 is a wasteful number, since it uses less digits than its factorization.

86591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 792.

The product of its digits is 2160, while the sum is 29.

The square root of 86591 is about 294.2634873714. The cubic root of 86591 is about 44.2409303978.

The spelling of 86591 in words is "eighty-six thousand, five hundred ninety-one".