86644231 has 2 divisors, whose sum is σ = 86644232. Its totient is φ = 86644230.

The previous prime is 86644177. The next prime is 86644247. The reversal of 86644231 is 13244668.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 86644231 - 2¹⁵ = 86611463 is a prime.

It is a super-2 number, since 2×86644231² = 15014445531162722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86644031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43322115 + 43322116.

It is an arithmetic number, because the mean of its divisors is an integer number (43322116).

Almost surely, 2^86644231 is an apocalyptic number.

86644231 is a deficient number, since it is larger than the sum of its proper divisors (1).

86644231 is an equidigital number, since it uses as much as digits as its factorization.

86644231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27648, while the sum is 34.

The square root of 86644231 is about 9308.2882959221. The cubic root of 86644231 is about 442.4999410557.

Adding to 86644231 its reverse (13244668), we get a palindrome (99888899).

The spelling of 86644231 in words is "eighty-six million, six hundred forty-four thousand, two hundred thirty-one".