243240243 has 4 divisors (see below), whose sum is σ = 324320328. Its totient is φ = 162160160.

The previous prime is 243240227. The next prime is 243240247. The reversal of 243240243 is 342042342.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 243240243 - 2⁴ = 243240227 is a prime.

It is not an unprimeable number, because it can be changed into a prime (243240247) 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, 40540038 + ... + 40540043.

It is an arithmetic number, because the mean of its divisors is an integer number (81080082).

Almost surely, 2^243240243 is an apocalyptic number.

243240243 is a deficient number, since it is larger than the sum of its proper divisors (81080085).

243240243 is an equidigital number, since it uses as much as digits as its factorization.

243240243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81080084.

The product of its (nonzero) digits is 4608, while the sum is 24.

The square root of 243240243 is about 15596.1611622861. The cubic root of 243240243 is about 624.2307275670.

Adding to 243240243 its reverse (342042342), we get a palindrome (585282585).

The spelling of 243240243 in words is "two hundred forty-three million, two hundred forty thousand, two hundred forty-three".