243909297 has 12 divisors (see below), whose sum is σ = 353155764. Its totient is φ = 162217440.

The previous prime is 243909283. The next prime is 243909307. The reversal of 243909297 is 792909342.

It can be written as a sum of positive squares in 2 ways, for example, as 75325041 + 168584256 = 8679^2 + 12984^2 .

It is not a de Polignac number, because 243909297 - 2¹⁸ = 243647153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (243909097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28398 + ... + 35975.

It is an arithmetic number, because the mean of its divisors is an integer number (29429647).

Almost surely, 2^243909297 is an apocalyptic number.

It is an amenable number.

243909297 is a deficient number, since it is larger than the sum of its proper divisors (109246467).

243909297 is a wasteful number, since it uses less digits than its factorization.

243909297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64800 (or 64797 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 45.

The square root of 243909297 is about 15617.5957496665. The cubic root of 243909297 is about 624.8025377271.

Adding to 243909297 its sum of digits (45), we get a palindrome (243909342).

The spelling of 243909297 in words is "two hundred forty-three million, nine hundred nine thousand, two hundred ninety-seven".