12342543409 has 27 divisors (see below), whose sum is σ = 14659623147. Its totient is φ = 10361350608.

The previous prime is 12342543377. The next prime is 12342543413. The reversal of 12342543409 is 90434524321.

The square root of 12342543409 is 111097.

It is a perfect power (a square), and thus also a powerful number.

12342543409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 812079009 + 11530464400 = 28497^2 + 107380^2 .

It is not a de Polignac number, because 12342543409 - 2⁵ = 12342543377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12342543419) 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 26 ways as a sum of consecutive naturals, for example, 45882927 + ... + 45883195.

Almost surely, 2^12342543409 is an apocalyptic number.

12342543409 is the 111097-th square number.

12342543409 is the 55549-th centered octagonal number.

It is an amenable number.

12342543409 is a deficient number, since it is larger than the sum of its proper divisors (2317079738).

12342543409 is an frugal number, since it uses more digits than its factorization.

12342543409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670 (or 335 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 37.

The spelling of 12342543409 in words is "twelve billion, three hundred forty-two million, five hundred forty-three thousand, four hundred nine".