86686191 has 24 divisors (see below), whose sum is σ = 130260000. Its totient is φ = 55484352.

The previous prime is 86686181. The next prime is 86686207. The reversal of 86686191 is 19168668.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-86686191 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86686181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 51105 + ... + 52773.

It is an arithmetic number, because the mean of its divisors is an integer number (5427500).

Almost surely, 2^86686191 is an apocalyptic number.

86686191 is a deficient number, since it is larger than the sum of its proper divisors (43573809).

86686191 is a wasteful number, since it uses less digits than its factorization.

86686191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1903 (or 1900 counting only the distinct ones).

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

The square root of 86686191 is about 9310.5419283734. The cubic root of 86686191 is about 442.5713607023.

The spelling of 86686191 in words is "eighty-six million, six hundred eighty-six thousand, one hundred ninety-one".