9191000090999 has 2 divisors, whose sum is σ = 9191000091000. Its totient is φ = 9191000090998.

The previous prime is 9191000090989. The next prime is 9191000091011. The reversal of 9191000090999 is 9990900001919.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9191000090999 - 2¹² = 9191000086903 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9191000090939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4595500045499 + 4595500045500.

It is an arithmetic number, because the mean of its divisors is an integer number (4595500045500).

Almost surely, 2^{9191000090999} is an apocalyptic number.

9191000090999 is a deficient number, since it is larger than the sum of its proper divisors (1).

9191000090999 is an equidigital number, since it uses as much as digits as its factorization.

9191000090999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 531441, while the sum is 56.

The spelling of 9191000090999 in words is "nine trillion, one hundred ninety-one billion, ninety thousand, nine hundred ninety-nine".