243223291 has 2 divisors, whose sum is σ = 243223292. Its totient is φ = 243223290.

The previous prime is 243223289. The next prime is 243223339. The reversal of 243223291 is 192322342.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 243223291 - 2¹ = 243223289 is a prime.

Together with 243223289, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_13328470 and since 243223291 and 13328470 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 (243223271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121611645 + 121611646.

It is an arithmetic number, because the mean of its divisors is an integer number (121611646).

Almost surely, 2^243223291 is an apocalyptic number.

243223291 is a deficient number, since it is larger than the sum of its proper divisors (1).

243223291 is an equidigital number, since it uses as much as digits as its factorization.

243223291 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 28.

The square root of 243223291 is about 15595.6176857475. The cubic root of 243223291 is about 624.2162258478.

The spelling of 243223291 in words is "two hundred forty-three million, two hundred twenty-three thousand, two hundred ninety-one".