86564591 has 2 divisors, whose sum is σ = 86564592. Its totient is φ = 86564590.

The previous prime is 86564587. The next prime is 86564689. The reversal of 86564591 is 19546568.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 86564591 - 2² = 86564587 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86564501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43282295 + 43282296.

It is an arithmetic number, because the mean of its divisors is an integer number (43282296).

Almost surely, 2^86564591 is an apocalyptic number.

86564591 is a deficient number, since it is larger than the sum of its proper divisors (1).

86564591 is an equidigital number, since it uses as much as digits as its factorization.

86564591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 259200, while the sum is 44.

The square root of 86564591 is about 9304.0094045524. The cubic root of 86564591 is about 442.3643232628.

It can be divided in two parts, 865 and 64591, that added together give a palindrome (65456).

The spelling of 86564591 in words is "eighty-six million, five hundred sixty-four thousand, five hundred ninety-one".