243225217 has 2 divisors, whose sum is σ = 243225218. Its totient is φ = 243225216.

The previous prime is 243225187. The next prime is 243225221. The reversal of 243225217 is 712522342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 167029776 + 76195441 = 12924^2 + 8729^2 .

It is a cyclic number.

It is not a de Polignac number, because 243225217 - 2¹⁵ = 243192449 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (243225247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121612608 + 121612609.

It is an arithmetic number, because the mean of its divisors is an integer number (121612609).

Almost surely, 2^243225217 is an apocalyptic number.

It is an amenable number.

243225217 is a deficient number, since it is larger than the sum of its proper divisors (1).

243225217 is an equidigital number, since it uses as much as digits as its factorization.

243225217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6720, while the sum is 28.

The square root of 243225217 is about 15595.6794337406. The cubic root of 243225217 is about 624.2178734933.

Adding to 243225217 its reverse (712522342), we get a palindrome (955747559).

The spelling of 243225217 in words is "two hundred forty-three million, two hundred twenty-five thousand, two hundred seventeen".