86409191 has 4 divisors (see below), whose sum is σ = 94264584. Its totient is φ = 78553800.

The previous prime is 86409187. The next prime is 86409199. The reversal of 86409191 is 19190468.

It is a happy number.

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 86409191 - 2² = 86409187 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 (86409199) 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, 3927680 + ... + 3927701.

It is an arithmetic number, because the mean of its divisors is an integer number (23566146).

Almost surely, 2^86409191 is an apocalyptic number.

86409191 is a deficient number, since it is larger than the sum of its proper divisors (7855393).

86409191 is a wasteful number, since it uses less digits than its factorization.

86409191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7855392.

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 86409191 is about 9295.6544148328. The cubic root of 86409191 is about 442.0994551762.

The spelling of 86409191 in words is "eighty-six million, four hundred nine thousand, one hundred ninety-one".