12189131 has 4 divisors (see below), whose sum is σ = 12336072. Its totient is φ = 12042192.

The previous prime is 12189097. The next prime is 12189139. The reversal of 12189131 is 13198121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13198121 = 2311 ⋅5711.

It is a cyclic number.

It is not a de Polignac number, because 12189131 - 2¹⁰ = 12188107 is a prime.

It is a super-2 number, since 2×12189131² = 297149829070322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12189131.

It is not an unprimeable number, because it can be changed into a prime (12189139) 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 in 3 ways as a sum of consecutive naturals, for example, 73346 + ... + 73511.

It is an arithmetic number, because the mean of its divisors is an integer number (3084018).

Almost surely, 2^12189131 is an apocalyptic number.

12189131 is a deficient number, since it is larger than the sum of its proper divisors (146941).

12189131 is an equidigital number, since it uses as much as digits as its factorization.

12189131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146940.

The product of its digits is 432, while the sum is 26.

The square root of 12189131 is about 3491.2935997994. The cubic root of 12189131 is about 230.1393673299.

The spelling of 12189131 in words is "twelve million, one hundred eighty-nine thousand, one hundred thirty-one".