243042555289 has 2 divisors, whose sum is σ = 243042555290. Its totient is φ = 243042555288.

The previous prime is 243042555281. The next prime is 243042555293. The reversal of 243042555289 is 982555240342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 241808227600 + 1234327689 = 491740^2 + 35133^2 .

It is a cyclic number.

It is not a de Polignac number, because 243042555289 - 2³ = 243042555281 is a prime.

It is not a weakly prime, because it can be changed into another prime (243042555281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121521277644 + 121521277645.

It is an arithmetic number, because the mean of its divisors is an integer number (121521277645).

Almost surely, 2^243042555289 is an apocalyptic number.

It is an amenable number.

243042555289 is a deficient number, since it is larger than the sum of its proper divisors (1).

243042555289 is an equidigital number, since it uses as much as digits as its factorization.

243042555289 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456000, while the sum is 49.

The spelling of 243042555289 in words is "two hundred forty-three billion, forty-two million, five hundred fifty-five thousand, two hundred eighty-nine".