243022409 has 6 divisors (see below), whose sum is σ = 282699594. Its totient is φ = 208304880.

The previous prime is 243022399. The next prime is 243022453. The reversal of 243022409 is 904220342.

It can be written as a sum of positive squares in only one way, i.e., 232654009 + 10368400 = 15253^2 + 3220^2 .

It is not a de Polignac number, because 243022409 - 2¹⁶ = 242956873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243022459) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2479772 + ... + 2479869.

It is an arithmetic number, because the mean of its divisors is an integer number (47116599).

Almost surely, 2^243022409 is an apocalyptic number.

It is an amenable number.

243022409 is a deficient number, since it is larger than the sum of its proper divisors (39677185).

243022409 is an equidigital number, since it uses as much as digits as its factorization.

243022409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4959655 (or 4959648 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 243022409 is about 15589.1760205599. The cubic root of 243022409 is about 624.0443284652.

The spelling of 243022409 in words is "two hundred forty-three million, twenty-two thousand, four hundred nine".