12981805189 has 2 divisors, whose sum is σ = 12981805190. Its totient is φ = 12981805188.

The previous prime is 12981805169. The next prime is 12981805201. The reversal of 12981805189 is 98150818921.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7719028164 + 5262777025 = 87858^2 + 72545^2 .

It is a cyclic number.

It is not a de Polignac number, because 12981805189 - 2⁹ = 12981804677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12981805139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6490902594 + 6490902595.

It is an arithmetic number, because the mean of its divisors is an integer number (6490902595).

Almost surely, 2^12981805189 is an apocalyptic number.

It is an amenable number.

12981805189 is a deficient number, since it is larger than the sum of its proper divisors (1).

12981805189 is an equidigital number, since it uses as much as digits as its factorization.

12981805189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 414720, while the sum is 52.

The spelling of 12981805189 in words is "twelve billion, nine hundred eighty-one million, eight hundred five thousand, one hundred eighty-nine".