909190091 has 4 divisors (see below), whose sum is σ = 919405800. Its totient is φ = 898974384.

The previous prime is 909190081. The next prime is 909190099. The reversal of 909190091 is 190091909.

It is a happy number.

909190091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 909190091 - 2⁶ = 909190027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (909190099) 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, 5107721 + ... + 5107898.

It is an arithmetic number, because the mean of its divisors is an integer number (229851450).

Almost surely, 2^909190091 is an apocalyptic number.

909190091 is a deficient number, since it is larger than the sum of its proper divisors (10215709).

909190091 is a wasteful number, since it uses less digits than its factorization.

909190091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10215708.

The product of its (nonzero) digits is 6561, while the sum is 38.

The square root of 909190091 is about 30152.7791588106. The cubic root of 909190091 is about 968.7645343584.

The spelling of 909190091 in words is "nine hundred nine million, one hundred ninety thousand, ninety-one".