243205229 has 4 divisors (see below), whose sum is σ = 243940320. Its totient is φ = 242470140.

The previous prime is 243205201. The next prime is 243205241. The reversal of 243205229 is 922502342.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 922502342 = 2 ⋅461251171.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243205229 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243205129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 367049 + ... + 367710.

It is an arithmetic number, because the mean of its divisors is an integer number (60985080).

Almost surely, 2^243205229 is an apocalyptic number.

It is an amenable number.

243205229 is a deficient number, since it is larger than the sum of its proper divisors (735091).

243205229 is an equidigital number, since it uses as much as digits as its factorization.

243205229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 735090.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 243205229 is about 15595.0386020683. The cubic root of 243205229 is about 624.2007738290.

The spelling of 243205229 in words is "two hundred forty-three million, two hundred five thousand, two hundred twenty-nine".