243143217 has 12 divisors (see below), whose sum is σ = 356018884. Its totient is φ = 159874560.

The previous prime is 243143203. The next prime is 243143227. The reversal of 243143217 is 712341342.

It is a happy number.

243143217 is a `hidden beast` number, since 24 + 314 + 321 + 7 = 666.

243143217 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 126697536 + 116445681 = 11256^2 + 10791^2 .

It is not a de Polignac number, because 243143217 - 2¹⁸ = 242881073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243143227) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 184384 + ... + 185697.

Almost surely, 2^243143217 is an apocalyptic number.

It is an amenable number.

243143217 is a deficient number, since it is larger than the sum of its proper divisors (112875667).

243143217 is a wasteful number, since it uses less digits than its factorization.

243143217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370160 (or 370157 counting only the distinct ones).

The product of its digits is 4032, while the sum is 27.

The square root of 243143217 is about 15593.0502788903. The cubic root of 243143217 is about 624.1477168164.

Adding to 243143217 its reverse (712341342), we get a palindrome (955484559).

The spelling of 243143217 in words is "two hundred forty-three million, one hundred forty-three thousand, two hundred seventeen".