91033985 has 16 divisors (see below), whose sum is σ = 126354816. Its totient is φ = 61669248.

The previous prime is 91033979. The next prime is 91034029. The reversal of 91033985 is 58933019.

It is a cyclic number.

It is not a de Polignac number, because 91033985 - 2¹⁰ = 91032961 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12764 + ... + 18573.

It is an arithmetic number, because the mean of its divisors is an integer number (7897176).

Almost surely, 2^91033985 is an apocalyptic number.

It is an amenable number.

91033985 is a deficient number, since it is larger than the sum of its proper divisors (35320831).

91033985 is a wasteful number, since it uses less digits than its factorization.

91033985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31432.

The product of its (nonzero) digits is 29160, while the sum is 38.

The square root of 91033985 is about 9541.1731458977. The cubic root of 91033985 is about 449.8501311629.

The spelling of 91033985 in words is "ninety-one million, thirty-three thousand, nine hundred eighty-five".