12105543449 has 4 divisors (see below), whose sum is σ = 12230342964. Its totient is φ = 11980743936.

The previous prime is 12105543409. The next prime is 12105543469. The reversal of 12105543449 is 94434550121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6421137424 + 5684406025 = 80132^2 + 75395^2 .

It is a cyclic number.

It is not a de Polignac number, because 12105543449 - 2¹⁶ = 12105477913 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12105543409) 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 3 ways as a sum of consecutive naturals, for example, 62399612 + ... + 62399805.

It is an arithmetic number, because the mean of its divisors is an integer number (3057585741).

Almost surely, 2^12105543449 is an apocalyptic number.

It is an amenable number.

12105543449 is a deficient number, since it is larger than the sum of its proper divisors (124799515).

12105543449 is an equidigital number, since it uses as much as digits as its factorization.

12105543449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124799514.

The product of its (nonzero) digits is 86400, while the sum is 38.

The spelling of 12105543449 in words is "twelve billion, one hundred five million, five hundred forty-three thousand, four hundred forty-nine".