243987343409 has 2 divisors, whose sum is σ = 243987343410. Its totient is φ = 243987343408.

The previous prime is 243987343387. The next prime is 243987343433. The reversal of 243987343409 is 904343789342.

243987343409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 122902830625 + 121084512784 = 350575^2 + 347972^2 .

It is a cyclic number.

It is not a de Polignac number, because 243987343409 - 2²⁴ = 243970566193 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (243987343009) 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 as a sum of consecutive naturals, namely, 121993671704 + 121993671705.

It is an arithmetic number, because the mean of its divisors is an integer number (121993671705).

Almost surely, 2^243987343409 is an apocalyptic number.

It is an amenable number.

243987343409 is a deficient number, since it is larger than the sum of its proper divisors (1).

243987343409 is an equidigital number, since it uses as much as digits as its factorization.

243987343409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15676416, while the sum is 56.

The spelling of 243987343409 in words is "two hundred forty-three billion, nine hundred eighty-seven million, three hundred forty-three thousand, four hundred nine".