86431 has 4 divisors (see below), whose sum is σ = 91000. Its totient is φ = 81864.

The previous prime is 86423. The next prime is 86441. The reversal of 86431 is 13468.

86431 is nontrivially palindromic in base 6.

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 86431 - 2³ = 86423 is a prime.

It is a super-2 number, since 2×86431² = 14940635522, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86441) 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, 2256 + ... + 2293.

It is an arithmetic number, because the mean of its divisors is an integer number (22750).

2⁸⁶⁴³¹ is an apocalyptic number.

86431 is a deficient number, since it is larger than the sum of its proper divisors (4569).

86431 is a wasteful number, since it uses less digits than its factorization.

86431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4568.

The product of its digits is 576, while the sum is 22.

The square root of 86431 is about 293.9914964757. The cubic root of 86431 is about 44.2136646189.

Adding to 86431 its reverse (13468), we get a palindrome (99899).

The spelling of 86431 in words is "eighty-six thousand, four hundred thirty-one".