9090891 has 24 divisors (see below), whose sum is σ = 13830960. Its totient is φ = 5745600.

The previous prime is 9090871. The next prime is 9090901. The reversal of 9090891 is 1980909.

It is not a de Polignac number, because 9090891 - 2⁵ = 9090859 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9090811) 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 23 ways as a sum of consecutive naturals, for example, 15636 + ... + 16206.

It is an arithmetic number, because the mean of its divisors is an integer number (576290).

Almost surely, 2^9090891 is an apocalyptic number.

9090891 is a deficient number, since it is larger than the sum of its proper divisors (4740069).

9090891 is a wasteful number, since it uses less digits than its factorization.

9090891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 667 (or 664 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 36.

The square root of 9090891 is about 3015.1104457383. The cubic root of 9090891 is about 208.7062638003.

The spelling of 9090891 in words is "nine million, ninety thousand, eight hundred ninety-one".