86591231581 has 8 divisors (see below), whose sum is σ = 88922361600. Its totient is φ = 84290977680.

The previous prime is 86591231543. The next prime is 86591231593. The reversal of 86591231581 is 18513219568.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 86591231581 - 2²⁵ = 86557677149 is a prime.

It is a super-2 number, since 2×86591231581² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86591231521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7713346 + ... + 7724563.

It is an arithmetic number, because the mean of its divisors is an integer number (11115295200).

Almost surely, 2^86591231581 is an apocalyptic number.

It is an amenable number.

86591231581 is a deficient number, since it is larger than the sum of its proper divisors (2331130019).

86591231581 is a wasteful number, since it uses less digits than its factorization.

86591231581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15438059.

The product of its digits is 518400, while the sum is 49.

The spelling of 86591231581 in words is "eighty-six billion, five hundred ninety-one million, two hundred thirty-one thousand, five hundred eighty-one".