999998811191 has 2 divisors, whose sum is σ = 999998811192. Its totient is φ = 999998811190.

The previous prime is 999998811179. The next prime is 999998811199. The reversal of 999998811191 is 191118899999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 999998811191 - 2¹⁸ = 999998549047 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999998811199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499999405595 + 499999405596.

It is an arithmetic number, because the mean of its divisors is an integer number (499999405596).

Almost surely, 2^999998811191 is an apocalyptic number.

999998811191 is a deficient number, since it is larger than the sum of its proper divisors (1).

999998811191 is an equidigital number, since it uses as much as digits as its factorization.

999998811191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34012224, while the sum is 74.

The spelling of 999998811191 in words is "nine hundred ninety-nine billion, nine hundred ninety-eight million, eight hundred eleven thousand, one hundred ninety-one".