9091009 has 2 divisors, whose sum is σ = 9091010. Its totient is φ = 9091008.

The previous prime is 9090989. The next prime is 9091021. The reversal of 9091009 is 9001909.

9091009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9090225 + 784 = 3015^2 + 28^2 .

It is a cyclic number.

It is not a de Polignac number, because 9091009 - 2¹⁵ = 9058241 is a prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (9091079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4545504 + 4545505.

It is an arithmetic number, because the mean of its divisors is an integer number (4545505).

Almost surely, 2^9091009 is an apocalyptic number.

It is an amenable number.

9091009 is a deficient number, since it is larger than the sum of its proper divisors (1).

9091009 is an equidigital number, since it uses as much as digits as its factorization.

9091009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 729, while the sum is 28.

The square root of 9091009 is about 3015.1300137805. The cubic root of 9091009 is about 208.7071668006.

The spelling of 9091009 in words is "nine million, ninety-one thousand, nine".