990202091 has 2 divisors, whose sum is σ = 990202092. Its totient is φ = 990202090.

The previous prime is 990202069. The next prime is 990202097. The reversal of 990202091 is 190202099.

990202091 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 is a cyclic number.

It is not a de Polignac number, because 990202091 - 2⁶ = 990202027 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (990202097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495101045 + 495101046.

It is an arithmetic number, because the mean of its divisors is an integer number (495101046).

Almost surely, 2^990202091 is an apocalyptic number.

990202091 is a deficient number, since it is larger than the sum of its proper divisors (1).

990202091 is an equidigital number, since it uses as much as digits as its factorization.

990202091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2916, while the sum is 32.

The square root of 990202091 is about 31467.4767180338. The cubic root of 990202091 is about 996.7233053324.

The spelling of 990202091 in words is "nine hundred ninety million, two hundred two thousand, ninety-one".