9090199091 has 2 divisors, whose sum is σ = 9090199092. Its totient is φ = 9090199090.

The previous prime is 9090199067. The next prime is 9090199187. The reversal of 9090199091 is 1909910909.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9090199091 - 2¹⁴ = 9090182707 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (9090199291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4545099545 + 4545099546.

It is an arithmetic number, because the mean of its divisors is an integer number (4545099546).

Almost surely, 2^9090199091 is an apocalyptic number.

9090199091 is a deficient number, since it is larger than the sum of its proper divisors (1).

9090199091 is an equidigital number, since it uses as much as digits as its factorization.

9090199091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 59049, while the sum is 47.

The square root of 9090199091 is about 95342.5355809253. The cubic root of 9090199091 is about 2087.0096877823.

The spelling of 9090199091 in words is "nine billion, ninety million, one hundred ninety-nine thousand, ninety-one".