243421247 has 2 divisors, whose sum is σ = 243421248. Its totient is φ = 243421246.

The previous prime is 243421193. The next prime is 243421253. The reversal of 243421247 is 742124342.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 243421247 - 2⁶ = 243421183 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243421847) 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 as a sum of consecutive naturals, namely, 121710623 + 121710624.

It is an arithmetic number, because the mean of its divisors is an integer number (121710624).

Almost surely, 2^243421247 is an apocalyptic number.

243421247 is a deficient number, since it is larger than the sum of its proper divisors (1).

243421247 is an equidigital number, since it uses as much as digits as its factorization.

243421247 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10752, while the sum is 29.

The square root of 243421247 is about 15601.9629213763. The cubic root of 243421247 is about 624.3855268477.

Adding to 243421247 its reverse (742124342), we get a palindrome (985545589).

The spelling of 243421247 in words is "two hundred forty-three million, four hundred twenty-one thousand, two hundred forty-seven".