243171217 has 2 divisors, whose sum is σ = 243171218. Its totient is φ = 243171216.

The previous prime is 243171197. The next prime is 243171221. The reversal of 243171217 is 712171342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 135862336 + 107308881 = 11656^2 + 10359^2 .

It is a cyclic number.

It is not a de Polignac number, because 243171217 - 2²³ = 234782609 is a prime.

It is a super-2 number, since 2×243171217² = 118264481554522178, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (243171317) 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, 121585608 + 121585609.

It is an arithmetic number, because the mean of its divisors is an integer number (121585609).

Almost surely, 2^243171217 is an apocalyptic number.

It is an amenable number.

243171217 is a deficient number, since it is larger than the sum of its proper divisors (1).

243171217 is an equidigital number, since it uses as much as digits as its factorization.

243171217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2352, while the sum is 28.

The square root of 243171217 is about 15593.9480889222. The cubic root of 243171217 is about 624.1716745280.

The spelling of 243171217 in words is "two hundred forty-three million, one hundred seventy-one thousand, two hundred seventeen".