243221359 has 2 divisors, whose sum is σ = 243221360. Its totient is φ = 243221358.

The previous prime is 243221357. The next prime is 243221371. The reversal of 243221359 is 953122342.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 243221359 - 2¹ = 243221357 is a prime.

Together with 243221357, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 243221359.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243221357) 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, 121610679 + 121610680.

It is an arithmetic number, because the mean of its divisors is an integer number (121610680).

Almost surely, 2^243221359 is an apocalyptic number.

243221359 is a deficient number, since it is larger than the sum of its proper divisors (1).

243221359 is an equidigital number, since it uses as much as digits as its factorization.

243221359 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 31.

The square root of 243221359 is about 15595.5557451474. Note that the first 3 decimals coincide. The cubic root of 243221359 is about 624.2145730607.

The spelling of 243221359 in words is "two hundred forty-three million, two hundred twenty-one thousand, three hundred fifty-nine".