243403241 has 2 divisors, whose sum is σ = 243403242. Its totient is φ = 243403240.

The previous prime is 243403211. The next prime is 243403327. The reversal of 243403241 is 142304342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 215355625 + 28047616 = 14675^2 + 5296^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243403241 is a prime.

It is not a weakly prime, because it can be changed into another prime (243403211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121701620 + 121701621.

It is an arithmetic number, because the mean of its divisors is an integer number (121701621).

Almost surely, 2^243403241 is an apocalyptic number.

It is an amenable number.

243403241 is a deficient number, since it is larger than the sum of its proper divisors (1).

243403241 is an equidigital number, since it uses as much as digits as its factorization.

243403241 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 23.

The square root of 243403241 is about 15601.3858679285. The cubic root of 243403241 is about 624.3701310908.

Adding to 243403241 its reverse (142304342), we get a palindrome (385707583).

The spelling of 243403241 in words is "two hundred forty-three million, four hundred three thousand, two hundred forty-one".