243204312009 has 8 divisors (see below), whose sum is σ = 324658918080. Its totient is φ = 161942956976.

The previous prime is 243204311899. The next prime is 243204312047. The reversal of 243204312009 is 900213402342.

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 243204312009 - 2¹⁷ = 243204180937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (243204312709) 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 in 7 ways as a sum of consecutive naturals, for example, 48309822 + ... + 48314855.

It is an arithmetic number, because the mean of its divisors is an integer number (40582364760).

Almost surely, 2^243204312009 is an apocalyptic number.

It is an amenable number.

243204312009 is a deficient number, since it is larger than the sum of its proper divisors (81454606071).

243204312009 is an equidigital number, since it uses as much as digits as its factorization.

243204312009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96625519.

The product of its (nonzero) digits is 10368, while the sum is 30.

The spelling of 243204312009 in words is "two hundred forty-three billion, two hundred four million, three hundred twelve thousand, nine".