9191010202009 has 4 divisors (see below), whose sum is σ = 9196426238004. Its totient is φ = 9185594166016.

The previous prime is 9191010201977. The next prime is 9191010202019. The reversal of 9191010202009 is 9002020101919.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4622758003600 + 4568252198409 = 2150060^2 + 2137347^2 .

It is a cyclic number.

It is not a de Polignac number, because 9191010202009 - 2⁵ = 9191010201977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9191010202019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2708015452 + ... + 2708018845.

It is an arithmetic number, because the mean of its divisors is an integer number (2299106559501).

Almost surely, 2^{9191010202009} is an apocalyptic number.

It is an amenable number.

9191010202009 is a deficient number, since it is larger than the sum of its proper divisors (5416035995).

9191010202009 is a wasteful number, since it uses less digits than its factorization.

9191010202009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5416035994.

The product of its (nonzero) digits is 2916, while the sum is 34.

The spelling of 9191010202009 in words is "nine trillion, one hundred ninety-one billion, ten million, two hundred two thousand, nine".