243205249 has 8 divisors (see below), whose sum is σ = 278076800. Its totient is φ = 208365696.

The previous prime is 243205241. The next prime is 243205271. The reversal of 243205249 is 942502342.

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

It is not a de Polignac number, because 243205249 - 2³ = 243205241 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 243205249.

It is not an unprimeable number, because it can be changed into a prime (243205241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11452 + ... + 24850.

It is an arithmetic number, because the mean of its divisors is an integer number (34759600).

Almost surely, 2^243205249 is an apocalyptic number.

It is an amenable number.

243205249 is a deficient number, since it is larger than the sum of its proper divisors (34871551).

243205249 is a wasteful number, since it uses less digits than its factorization.

243205249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15999.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 243205249 is about 15595.0392432979. The cubic root of 243205249 is about 624.2007909394.

The spelling of 243205249 in words is "two hundred forty-three million, two hundred five thousand, two hundred forty-nine".