86566391 has 4 divisors (see below), whose sum is σ = 86586072. Its totient is φ = 86546712.

The previous prime is 86566387. The next prime is 86566399. The reversal of 86566391 is 19366568.

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 86566391 - 2² = 86566387 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86566399) 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, 116 + ... + 13158.

It is an arithmetic number, because the mean of its divisors is an integer number (21646518).

Almost surely, 2^86566391 is an apocalyptic number.

86566391 is a deficient number, since it is larger than the sum of its proper divisors (19681).

86566391 is a wasteful number, since it uses less digits than its factorization.

86566391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19680.

The product of its digits is 233280, while the sum is 44.

The square root of 86566391 is about 9304.1061365399. The cubic root of 86566391 is about 442.3673893751.

The spelling of 86566391 in words is "eighty-six million, five hundred sixty-six thousand, three hundred ninety-one".