243040201 has 2 divisors, whose sum is σ = 243040202. Its totient is φ = 243040200.

The previous prime is 243040199. The next prime is 243040247. The reversal of 243040201 is 102040342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 219040000 + 24000201 = 14800^2 + 4899^2 .

It is a cyclic number.

It is not a de Polignac number, because 243040201 - 2¹ = 243040199 is a prime.

Together with 243040199, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (243040801) 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, 121520100 + 121520101.

It is an arithmetic number, because the mean of its divisors is an integer number (121520101).

Almost surely, 2^243040201 is an apocalyptic number.

It is an amenable number.

243040201 is a deficient number, since it is larger than the sum of its proper divisors (1).

243040201 is an equidigital number, since it uses as much as digits as its factorization.

243040201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 243040201 is about 15589.7466624702. The cubic root of 243040201 is about 624.0595571373.

Adding to 243040201 its reverse (102040342), we get a palindrome (345080543).

The spelling of 243040201 in words is "two hundred forty-three million, forty thousand, two hundred one".