9100090091 has 4 divisors (see below), whose sum is σ = 9100358400. Its totient is φ = 9099821784.

The previous prime is 9100090073. The next prime is 9100090099. The reversal of 9100090091 is 1900900019.

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 9100090091 - 2²⁶ = 9032981227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9100090099) 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, 74411 + ... + 154068.

It is an arithmetic number, because the mean of its divisors is an integer number (2275089600).

Almost surely, 2^9100090091 is an apocalyptic number.

9100090091 is a deficient number, since it is larger than the sum of its proper divisors (268309).

9100090091 is a wasteful number, since it uses less digits than its factorization.

9100090091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268308.

The product of its (nonzero) digits is 729, while the sum is 29.

The square root of 9100090091 is about 95394.3923456720. The cubic root of 9100090091 is about 2087.7663683235.

The spelling of 9100090091 in words is "nine billion, one hundred million, ninety thousand, ninety-one".