12191594677 has 2 divisors, whose sum is σ = 12191594678. Its totient is φ = 12191594676.

The previous prime is 12191594621. The next prime is 12191594707. The reversal of 12191594677 is 77649519121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8759275281 + 3432319396 = 93591^2 + 58586^2 .

It is an emirp because it is prime and its reverse (77649519121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12191594677 - 2¹⁵ = 12191561909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12191594377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6095797338 + 6095797339.

It is an arithmetic number, because the mean of its divisors is an integer number (6095797339).

Almost surely, 2^12191594677 is an apocalyptic number.

It is an amenable number.

12191594677 is a deficient number, since it is larger than the sum of its proper divisors (1).

12191594677 is an equidigital number, since it uses as much as digits as its factorization.

12191594677 is an evil number, because the sum of its binary digits is even.

The product of its digits is 952560, while the sum is 52.

The spelling of 12191594677 in words is "twelve billion, one hundred ninety-one million, five hundred ninety-four thousand, six hundred seventy-seven".