12189887549 has 16 divisors (see below), whose sum is σ = 14397136896. Its totient is φ = 10099868400.

The previous prime is 12189887491. The next prime is 12189887557. The reversal of 12189887549 is 94578898121.

It is a cyclic number.

It is not a de Polignac number, because 12189887549 - 2²⁴ = 12173110333 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12189887491 and 12189887500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12189883549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 160814 + ... + 224144.

It is an arithmetic number, because the mean of its divisors is an integer number (899821056).

Almost surely, 2^12189887549 is an apocalyptic number.

It is an amenable number.

12189887549 is a deficient number, since it is larger than the sum of its proper divisors (2207249347).

12189887549 is an equidigital number, since it uses as much as digits as its factorization.

12189887549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64256.

The product of its digits is 11612160, while the sum is 62.

The spelling of 12189887549 in words is "twelve billion, one hundred eighty-nine million, eight hundred eighty-seven thousand, five hundred forty-nine".