243165089 has 2 divisors, whose sum is σ = 243165090. Its totient is φ = 243165088.

The previous prime is 243165077. The next prime is 243165107. The reversal of 243165089 is 980561342.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 196925089 + 46240000 = 14033^2 + 6800^2 .

It is a cyclic number.

It is not a de Polignac number, because 243165089 - 2¹⁶ = 243099553 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 (243165049) 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 as a sum of consecutive naturals, namely, 121582544 + 121582545.

It is an arithmetic number, because the mean of its divisors is an integer number (121582545).

Almost surely, 2^243165089 is an apocalyptic number.

It is an amenable number.

243165089 is a deficient number, since it is larger than the sum of its proper divisors (1).

243165089 is an equidigital number, since it uses as much as digits as its factorization.

243165089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 243165089 is about 15593.7516012023. The cubic root of 243165089 is about 624.1664313689.

The spelling of 243165089 in words is "two hundred forty-three million, one hundred sixty-five thousand, eighty-nine".