243340613 has 4 divisors (see below), whose sum is σ = 245750028. Its totient is φ = 240931200.

The previous prime is 243340597. The next prime is 243340627. The reversal of 243340613 is 316043342.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 225210049 + 18130564 = 15007^2 + 4258^2 .

It is a cyclic number.

It is not a de Polignac number, because 243340613 - 2⁴ = 243340597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243340213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1204556 + ... + 1204757.

It is an arithmetic number, because the mean of its divisors is an integer number (61437507).

Almost surely, 2^243340613 is an apocalyptic number.

It is an amenable number.

243340613 is a deficient number, since it is larger than the sum of its proper divisors (2409415).

243340613 is a wasteful number, since it uses less digits than its factorization.

243340613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2409414.

The product of its (nonzero) digits is 5184, while the sum is 26.

The square root of 243340613 is about 15599.3786094190. The cubic root of 243340613 is about 624.3165760565.

Adding to 243340613 its reverse (316043342), we get a palindrome (559383955).

The spelling of 243340613 in words is "two hundred forty-three million, three hundred forty thousand, six hundred thirteen".