243066209 has 16 divisors (see below), whose sum is σ = 254338560. Its totient is φ = 232087680.

The previous prime is 243066181. The next prime is 243066227. The reversal of 243066209 is 902660342.

It is a de Polignac number, because none of the positive numbers 2^k-243066209 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (243065209) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 734174 + ... + 734504.

It is an arithmetic number, because the mean of its divisors is an integer number (15896160).

Almost surely, 2^243066209 is an apocalyptic number.

It is an amenable number.

243066209 is a deficient number, since it is larger than the sum of its proper divisors (11272351).

243066209 is a wasteful number, since it uses less digits than its factorization.

243066209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 680.

The product of its (nonzero) digits is 15552, while the sum is 32.

The square root of 243066209 is about 15590.5807781494. The cubic root of 243066209 is about 624.0818167772.

The spelling of 243066209 in words is "two hundred forty-three million, sixty-six thousand, two hundred nine".