86866191 has 6 divisors (see below), whose sum is σ = 125473400. Its totient is φ = 57910788.

The previous prime is 86866189. The next prime is 86866207. The reversal of 86866191 is 19166868.

It is a happy number.

It is not a de Polignac number, because 86866191 - 2¹ = 86866189 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 (86866181) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4825891 + ... + 4825908.

Almost surely, 2^86866191 is an apocalyptic number.

86866191 is a deficient number, since it is larger than the sum of its proper divisors (38607209).

86866191 is a wasteful number, since it uses less digits than its factorization.

86866191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9651805 (or 9651802 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The square root of 86866191 is about 9320.2033776093. The cubic root of 86866191 is about 442.8774754700.

The spelling of 86866191 in words is "eighty-six million, eight hundred sixty-six thousand, one hundred ninety-one".