243554089 has 2 divisors, whose sum is σ = 243554090. Its totient is φ = 243554088.

The previous prime is 243554083. The next prime is 243554119. The reversal of 243554089 is 980455342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 179426025 + 64128064 = 13395^2 + 8008^2 .

It is a cyclic number.

It is not a de Polignac number, because 243554089 - 2³ = 243554081 is a prime.

It is not a weakly prime, because it can be changed into another prime (243554081) 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, 121777044 + 121777045.

It is an arithmetic number, because the mean of its divisors is an integer number (121777045).

Almost surely, 2^243554089 is an apocalyptic number.

It is an amenable number.

243554089 is a deficient number, since it is larger than the sum of its proper divisors (1).

243554089 is an equidigital number, since it uses as much as digits as its factorization.

243554089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 172800, while the sum is 40.

The square root of 243554089 is about 15606.2195614441. The cubic root of 243554089 is about 624.4990879266.

The spelling of 243554089 in words is "two hundred forty-three million, five hundred fifty-four thousand, eighty-nine".