12543941009 has 4 divisors (see below), whose sum is σ = 12608935716. Its totient is φ = 12478946304.

The previous prime is 12543940993. The next prime is 12543941017. The reversal of 12543941009 is 90014934521.

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 2084379025 + 10459561984 = 45655^2 + 102272^2 .

It is a cyclic number.

It is not a de Polignac number, because 12543941009 - 2⁴ = 12543940993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12543941099) 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, 32497064 + ... + 32497449.

It is an arithmetic number, because the mean of its divisors is an integer number (3152233929).

Almost surely, 2^12543941009 is an apocalyptic number.

It is an amenable number.

12543941009 is a deficient number, since it is larger than the sum of its proper divisors (64994707).

12543941009 is an equidigital number, since it uses as much as digits as its factorization.

12543941009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64994706.

The product of its (nonzero) digits is 38880, while the sum is 38.

The spelling of 12543941009 in words is "twelve billion, five hundred forty-three million, nine hundred forty-one thousand, nine".