86816991 has 8 divisors (see below), whose sum is σ = 115804080. Its totient is φ = 57853952.

The previous prime is 86816987. The next prime is 86816993. The reversal of 86816991 is 19961868.

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 86816991 - 2² = 86816987 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 86816991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86816993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5641 + ... + 14333.

It is an arithmetic number, because the mean of its divisors is an integer number (14475510).

Almost surely, 2^86816991 is an apocalyptic number.

86816991 is a deficient number, since it is larger than the sum of its proper divisors (28987089).

86816991 is a wasteful number, since it uses less digits than its factorization.

86816991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12025.

The product of its digits is 186624, while the sum is 48.

The square root of 86816991 is about 9317.5635763863. The cubic root of 86816991 is about 442.7938461292.

The spelling of 86816991 in words is "eighty-six million, eight hundred sixteen thousand, nine hundred ninety-one".