91086785 has 16 divisors (see below), whose sum is σ = 117144576. Its totient is φ = 67814208.

The previous prime is 91086781. The next prime is 91086791. The reversal of 91086785 is 58768019.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 91086785 - 2² = 91086781 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (91086781) 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 15 ways as a sum of consecutive naturals, for example, 6449 + ... + 14958.

It is an arithmetic number, because the mean of its divisors is an integer number (7321536).

Almost surely, 2^91086785 is an apocalyptic number.

It is an amenable number.

91086785 is a deficient number, since it is larger than the sum of its proper divisors (26057791).

91086785 is a wasteful number, since it uses less digits than its factorization.

91086785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21472.

The product of its (nonzero) digits is 120960, while the sum is 44.

The square root of 91086785 is about 9543.9397001448. The cubic root of 91086785 is about 449.9370858546.

The spelling of 91086785 in words is "ninety-one million, eighty-six thousand, seven hundred eighty-five".