91435091 has 4 divisors (see below), whose sum is σ = 99747384. Its totient is φ = 83122800.

The previous prime is 91435079. The next prime is 91435111. The reversal of 91435091 is 19053419.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 91435091 - 2¹⁸ = 91172947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91435891) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 4156130 + ... + 4156151.

It is an arithmetic number, because the mean of its divisors is an integer number (24936846).

Almost surely, 2^91435091 is an apocalyptic number.

91435091 is a deficient number, since it is larger than the sum of its proper divisors (8312293).

91435091 is a wasteful number, since it uses less digits than its factorization.

91435091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8312292.

The product of its (nonzero) digits is 4860, while the sum is 32.

The square root of 91435091 is about 9562.1697851481. The cubic root of 91435091 is about 450.5098599593.

The spelling of 91435091 in words is "ninety-one million, four hundred thirty-five thousand, ninety-one".