243216241 has 2 divisors, whose sum is σ = 243216242. Its totient is φ = 243216240.

The previous prime is 243216227. The next prime is 243216257. The reversal of 243216241 is 142612342.

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., 182142016 + 61074225 = 13496^2 + 7815^2 .

It is a cyclic number.

It is not a de Polignac number, because 243216241 - 2²³ = 234827633 is a prime.

It is not a weakly prime, because it can be changed into another prime (243216221) 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, 121608120 + 121608121.

It is an arithmetic number, because the mean of its divisors is an integer number (121608121).

Almost surely, 2^243216241 is an apocalyptic number.

It is an amenable number.

243216241 is a deficient number, since it is larger than the sum of its proper divisors (1).

243216241 is an equidigital number, since it uses as much as digits as its factorization.

243216241 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2304, while the sum is 25.

The square root of 243216241 is about 15595.3916590767. The cubic root of 243216241 is about 624.2101946725.

Adding to 243216241 its reverse (142612342), we get a palindrome (385828583).

The spelling of 243216241 in words is "two hundred forty-three million, two hundred sixteen thousand, two hundred forty-one".