91093091 has 4 divisors (see below), whose sum is σ = 91161384. Its totient is φ = 91024800.

The previous prime is 91093073. The next prime is 91093099. The reversal of 91093091 is 19039019.

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 91093091 - 2⁶ = 91093027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91093099) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32105 + ... + 34826.

It is an arithmetic number, because the mean of its divisors is an integer number (22790346).

Almost surely, 2^91093091 is an apocalyptic number.

91093091 is a deficient number, since it is larger than the sum of its proper divisors (68293).

91093091 is a wasteful number, since it uses less digits than its factorization.

91093091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68292.

The product of its (nonzero) digits is 2187, while the sum is 32.

The square root of 91093091 is about 9544.2700611414. The cubic root of 91093091 is about 449.9474687651.

The spelling of 91093091 in words is "ninety-one million, ninety-three thousand, ninety-one".