86891 has 4 divisors (see below), whose sum is σ = 99312. Its totient is φ = 74472.

The previous prime is 86869. The next prime is 86923. The reversal of 86891 is 19868.

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 86891 - 2¹⁴ = 70507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (86851) 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, 6200 + ... + 6213.

It is an arithmetic number, because the mean of its divisors is an integer number (24828).

2⁸⁶⁸⁹¹ is an apocalyptic number.

86891 is a deficient number, since it is larger than the sum of its proper divisors (12421).

86891 is a wasteful number, since it uses less digits than its factorization.

86891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12420.

The product of its digits is 3456, while the sum is 32.

The square root of 86891 is about 294.7727938599. The cubic root of 86891 is about 44.2919633419.

It can be divided in two parts, 868 and 91, that added together give a palindrome (959).

The spelling of 86891 in words is "eighty-six thousand, eight hundred ninety-one".