243040361 has 2 divisors, whose sum is σ = 243040362. Its totient is φ = 243040360.

The previous prime is 243040331. The next prime is 243040363. The reversal of 243040361 is 163040342.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 229674025 + 13366336 = 15155^2 + 3656^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243040361 is a prime.

Together with 243040363, 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 (243040363) 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, 121520180 + 121520181.

It is an arithmetic number, because the mean of its divisors is an integer number (121520181).

Almost surely, 2^243040361 is an apocalyptic number.

It is an amenable number.

243040361 is a deficient number, since it is larger than the sum of its proper divisors (1).

243040361 is an equidigital number, since it uses as much as digits as its factorization.

243040361 is an odious number, because the sum of its binary digits is odd.

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

The square root of 243040361 is about 15589.7517940473. The cubic root of 243040361 is about 624.0596940824.

The spelling of 243040361 in words is "two hundred forty-three million, forty thousand, three hundred sixty-one".