243222613 has 2 divisors, whose sum is σ = 243222614. Its totient is φ = 243222612.

The previous prime is 243222611. The next prime is 243222643. The reversal of 243222613 is 316222342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 123254404 + 119968209 = 11102^2 + 10953^2 .

It is a cyclic number.

It is not a de Polignac number, because 243222613 - 2¹ = 243222611 is a prime.

Together with 243222611, it forms a pair of twin primes.

It is equal to p_13328431 and since 243222613 and 13328431 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243222611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121611306 + 121611307.

It is an arithmetic number, because the mean of its divisors is an integer number (121611307).

Almost surely, 2^243222613 is an apocalyptic number.

It is an amenable number.

243222613 is a deficient number, since it is larger than the sum of its proper divisors (1).

243222613 is an equidigital number, since it uses as much as digits as its factorization.

243222613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 25.

The square root of 243222613 is about 15595.5959488568. The cubic root of 243222613 is about 624.2156458334.

Adding to 243222613 its reverse (316222342), we get a palindrome (559444955).

The spelling of 243222613 in words is "two hundred forty-three million, two hundred twenty-two thousand, six hundred thirteen".