91685166 has 24 divisors (see below), whose sum is σ = 189488232. Its totient is φ = 29574000.

The previous prime is 91685147. The next prime is 91685227. The reversal of 91685166 is 66158619.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2185 + ... + 13716.

It is an arithmetic number, because the mean of its divisors is an integer number (7895343).

Almost surely, 2^91685166 is an apocalyptic number.

91685166 is an abundant number, since it is smaller than the sum of its proper divisors (97803066).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91685166 is a wasteful number, since it uses less digits than its factorization.

91685166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15968 (or 15937 counting only the distinct ones).

The product of its digits is 77760, while the sum is 42.

The square root of 91685166 is about 9575.2371250011. The cubic root of 91685166 is about 450.9202009573.

The spelling of 91685166 in words is "ninety-one million, six hundred eighty-five thousand, one hundred sixty-six".