243345241 has 2 divisors, whose sum is σ = 243345242. Its totient is φ = 243345240.

The previous prime is 243345239. The next prime is 243345301. The reversal of 243345241 is 142543342.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 242705241 + 640000 = 15579^2 + 800^2 .

It is a cyclic number.

It is not a de Polignac number, because 243345241 - 2¹ = 243345239 is a prime.

Together with 243345239, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (243345211) 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, 121672620 + 121672621.

It is an arithmetic number, because the mean of its divisors is an integer number (121672621).

Almost surely, 2^243345241 is an apocalyptic number.

It is an amenable number.

243345241 is a deficient number, since it is larger than the sum of its proper divisors (1).

243345241 is an equidigital number, since it uses as much as digits as its factorization.

243345241 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11520, while the sum is 28.

The square root of 243345241 is about 15599.5269479558. The cubic root of 243345241 is about 624.3205339090.

Adding to 243345241 its reverse (142543342), we get a palindrome (385888583).

It can be divided in two parts, 2433 and 45241, that added together give a palindrome (47674).

The spelling of 243345241 in words is "two hundred forty-three million, three hundred forty-five thousand, two hundred forty-one".