12191189 has 4 divisors (see below), whose sum is σ = 12450624. Its totient is φ = 11931756.

The previous prime is 12191171. The next prime is 12191191. The reversal of 12191189 is 98119121.

12191189 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 12191189 - 2²⁰ = 11142613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12191129) 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, 129647 + ... + 129740.

It is an arithmetic number, because the mean of its divisors is an integer number (3112656).

Almost surely, 2^12191189 is an apocalyptic number.

It is an amenable number.

12191189 is a deficient number, since it is larger than the sum of its proper divisors (259435).

12191189 is an equidigital number, since it uses as much as digits as its factorization.

12191189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259434.

The product of its digits is 1296, while the sum is 32.

The square root of 12191189 is about 3491.5883205212. The cubic root of 12191189 is about 230.1523187635.

The spelling of 12191189 in words is "twelve million, one hundred ninety-one thousand, one hundred eighty-nine".