243022313 has 2 divisors, whose sum is σ = 243022314. Its totient is φ = 243022312.

The previous prime is 243022229. The next prime is 243022337. The reversal of 243022313 is 313220342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 197486809 + 45535504 = 14053^2 + 6748^2 .

It is a cyclic number.

It is not a de Polignac number, because 243022313 - 2⁸ = 243022057 is a prime.

It is not a weakly prime, because it can be changed into another prime (243022343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121511156 + 121511157.

It is an arithmetic number, because the mean of its divisors is an integer number (121511157).

Almost surely, 2^243022313 is an apocalyptic number.

It is an amenable number.

243022313 is a deficient number, since it is larger than the sum of its proper divisors (1).

243022313 is an equidigital number, since it uses as much as digits as its factorization.

243022313 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 20.

The square root of 243022313 is about 15589.1729415001. The cubic root of 243022313 is about 624.0442462941.

Adding to 243022313 its reverse (313220342), we get a palindrome (556242655).

The spelling of 243022313 in words is "two hundred forty-three million, twenty-two thousand, three hundred thirteen".