91385818 has 8 divisors (see below), whose sum is σ = 138336660. Its totient is φ = 45273600.

The previous prime is 91385803. The next prime is 91385881. The reversal of 91385818 is 81858319.

It can be written as a sum of positive squares in 2 ways, for example, as 91068849 + 316969 = 9543^2 + 563^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 209383 + ... + 209818.

Almost surely, 2^91385818 is an apocalyptic number.

91385818 is a deficient number, since it is larger than the sum of its proper divisors (46950842).

91385818 is a wasteful number, since it uses less digits than its factorization.

91385818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419312.

The product of its digits is 69120, while the sum is 43.

The square root of 91385818 is about 9559.5929829674. The cubic root of 91385818 is about 450.4289210817.

The spelling of 91385818 in words is "ninety-one million, three hundred eighty-five thousand, eight hundred eighteen".