9191000090939 has 2 divisors, whose sum is σ = 9191000090940. Its totient is φ = 9191000090938.

The previous prime is 9191000090903. The next prime is 9191000090969. The reversal of 9191000090939 is 9390900001919.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9191000090939 is a prime.

It is not a weakly prime, because it can be changed into another prime (9191000090969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4595500045469 + 4595500045470.

It is an arithmetic number, because the mean of its divisors is an integer number (4595500045470).

Almost surely, 2^{9191000090939} is an apocalyptic number.

9191000090939 is a deficient number, since it is larger than the sum of its proper divisors (1).

9191000090939 is an equidigital number, since it uses as much as digits as its factorization.

9191000090939 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 177147, while the sum is 50.

The spelling of 9191000090939 in words is "nine trillion, one hundred ninety-one billion, ninety thousand, nine hundred thirty-nine".