243421313 has 2 divisors, whose sum is σ = 243421314. Its totient is φ = 243421312.

The previous prime is 243421303. The next prime is 243421333. The reversal of 243421313 is 313124342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 162996289 + 80425024 = 12767^2 + 8968^2 .

It is a cyclic number.

It is not a de Polignac number, because 243421313 - 2²⁰ = 242372737 is a prime.

It is not a weakly prime, because it can be changed into another prime (243421303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121710656 + 121710657.

It is an arithmetic number, because the mean of its divisors is an integer number (121710657).

Almost surely, 2^243421313 is an apocalyptic number.

It is an amenable number.

243421313 is a deficient number, since it is larger than the sum of its proper divisors (1).

243421313 is an equidigital number, since it uses as much as digits as its factorization.

243421313 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 23.

The square root of 243421313 is about 15601.9650364946. The cubic root of 243421313 is about 624.3855832786.

Adding to 243421313 its reverse (313124342), we get a palindrome (556545655).

The spelling of 243421313 in words is "two hundred forty-three million, four hundred twenty-one thousand, three hundred thirteen".