243213313 has 12 divisors (see below), whose sum is σ = 283937520. Its totient is φ = 207720072.

The previous prime is 243213307. The next prime is 243213329. The reversal of 243213313 is 313312342.

It is not a de Polignac number, because 243213313 - 2¹⁷ = 243082241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243213013) 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 11 ways as a sum of consecutive naturals, for example, 5098 + ... + 22636.

It is an arithmetic number, because the mean of its divisors is an integer number (23661460).

Almost surely, 2^243213313 is an apocalyptic number.

It is an amenable number.

243213313 is a deficient number, since it is larger than the sum of its proper divisors (40724207).

243213313 is a wasteful number, since it uses less digits than its factorization.

243213313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17836 (or 17829 counting only the distinct ones).

The product of its digits is 1296, while the sum is 22.

The square root of 243213313 is about 15595.2977849094. The cubic root of 243213313 is about 624.2076897756.

Adding to 243213313 its reverse (313312342), we get a palindrome (556525655).

The spelling of 243213313 in words is "two hundred forty-three million, two hundred thirteen thousand, three hundred thirteen".