243244643 has 2 divisors, whose sum is σ = 243244644. Its totient is φ = 243244642.

The previous prime is 243244627. The next prime is 243244649. The reversal of 243244643 is 346442342.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 243244643 - 2⁴ = 243244627 is a prime.

It is a Sophie Germain prime.

It is a zygodrome in base 2.

It is not a weakly prime, because it can be changed into another prime (243244649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121622321 + 121622322.

It is an arithmetic number, because the mean of its divisors is an integer number (121622322).

Almost surely, 2^243244643 is an apocalyptic number.

243244643 is a deficient number, since it is larger than the sum of its proper divisors (1).

243244643 is an equidigital number, since it uses as much as digits as its factorization.

243244643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 55296, while the sum is 32.

The square root of 243244643 is about 15596.3022220012. The cubic root of 243244643 is about 624.2344914708.

Adding to 243244643 its reverse (346442342), we get a palindrome (589686985).

The spelling of 243244643 in words is "two hundred forty-three million, two hundred forty-four thousand, six hundred forty-three".