9008921 has 2 divisors, whose sum is σ = 9008922. Its totient is φ = 9008920.

The previous prime is 9008911. The next prime is 9008927. The reversal of 9008921 is 1298009.

9008921 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., 6250000 + 2758921 = 2500^2 + 1661^2 .

It is a cyclic number.

It is not a de Polignac number, because 9008921 - 2²² = 4814617 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (9008927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4504460 + 4504461.

It is an arithmetic number, because the mean of its divisors is an integer number (4504461).

Almost surely, 2^9008921 is an apocalyptic number.

It is an amenable number.

9008921 is a deficient number, since it is larger than the sum of its proper divisors (1).

9008921 is an equidigital number, since it uses as much as digits as its factorization.

9008921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 9008921 is about 3001.4864650703. The cubic root of 9008921 is about 208.0770871199.

The spelling of 9008921 in words is "nine million, eight thousand, nine hundred twenty-one".