12198912191 has 2 divisors, whose sum is σ = 12198912192. Its totient is φ = 12198912190.

The previous prime is 12198912179. The next prime is 12198912199. The reversal of 12198912191 is 19121989121.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12198912191 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12198912199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6099456095 + 6099456096.

It is an arithmetic number, because the mean of its divisors is an integer number (6099456096).

Almost surely, 2^12198912191 is an apocalyptic number.

12198912191 is a deficient number, since it is larger than the sum of its proper divisors (1).

12198912191 is an equidigital number, since it uses as much as digits as its factorization.

12198912191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23328, while the sum is 44.

The spelling of 12198912191 in words is "twelve billion, one hundred ninety-eight million, nine hundred twelve thousand, one hundred ninety-one".