243215201 has 2 divisors, whose sum is σ = 243215202. Its totient is φ = 243215200.

The previous prime is 243215191. The next prime is 243215221. The reversal of 243215201 is 102512342.

It is an a-pointer prime, because the next prime (243215221) can be obtained adding 243215201 to its sum of digits (20).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 231648400 + 11566801 = 15220^2 + 3401^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243215201 is a prime.

It is equal to p_13328030 and since 243215201 and 13328030 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (243215221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121607600 + 121607601.

It is an arithmetic number, because the mean of its divisors is an integer number (121607601).

Almost surely, 2^243215201 is an apocalyptic number.

It is an amenable number.

243215201 is a deficient number, since it is larger than the sum of its proper divisors (1).

243215201 is an equidigital number, since it uses as much as digits as its factorization.

243215201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 243215201 is about 15595.3583158580. The cubic root of 243215201 is about 624.2093049573.

Adding to 243215201 its reverse (102512342), we get a palindrome (345727543).

The spelling of 243215201 in words is "two hundred forty-three million, two hundred fifteen thousand, two hundred one".