12191594689 has 4 divisors (see below), whose sum is σ = 12338481456. Its totient is φ = 12044707924.

The previous prime is 12191594677. The next prime is 12191594707. The reversal of 12191594689 is 98649519121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12191594689 - 2⁷ = 12191594561 is a prime.

It is a super-3 number, since 3×12191594689³ (a number of 31 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12191594189) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73443259 + ... + 73443424.

It is an arithmetic number, because the mean of its divisors is an integer number (3084620364).

Almost surely, 2^12191594689 is an apocalyptic number.

It is an amenable number.

12191594689 is a deficient number, since it is larger than the sum of its proper divisors (146886767).

12191594689 is an equidigital number, since it uses as much as digits as its factorization.

12191594689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146886766.

The product of its digits is 1399680, while the sum is 55.

The spelling of 12191594689 in words is "twelve billion, one hundred ninety-one million, five hundred ninety-four thousand, six hundred eighty-nine".