243143209 has 8 divisors (see below), whose sum is σ = 256127840. Its totient is φ = 230177376.

The previous prime is 243143203. The next prime is 243143227. The reversal of 243143209 is 902341342.

243143209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 243143209 - 2⁷ = 243143081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243143203) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27622 + ... + 35344.

It is an arithmetic number, because the mean of its divisors is an integer number (32015980).

Almost surely, 2^243143209 is an apocalyptic number.

It is an amenable number.

243143209 is a deficient number, since it is larger than the sum of its proper divisors (12984631).

243143209 is a wasteful number, since it uses less digits than its factorization.

243143209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9399.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 243143209 is about 15593.0500223657. The cubic root of 243143209 is about 624.1477099710.

The spelling of 243143209 in words is "two hundred forty-three million, one hundred forty-three thousand, two hundred nine".