12117844391 has 2 divisors, whose sum is σ = 12117844392. Its totient is φ = 12117844390.

The previous prime is 12117844373. The next prime is 12117844397. The reversal of 12117844391 is 19344871121.

12117844391 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12117844391 - 2¹⁴ = 12117828007 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12117844397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6058922195 + 6058922196.

It is an arithmetic number, because the mean of its divisors is an integer number (6058922196).

Almost surely, 2^12117844391 is an apocalyptic number.

12117844391 is a deficient number, since it is larger than the sum of its proper divisors (1).

12117844391 is an equidigital number, since it uses as much as digits as its factorization.

12117844391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 41.

The spelling of 12117844391 in words is "twelve billion, one hundred seventeen million, eight hundred forty-four thousand, three hundred ninety-one".