243400013243 has 2 divisors, whose sum is σ = 243400013244. Its totient is φ = 243400013242.

The previous prime is 243400013237. The next prime is 243400013251. The reversal of 243400013243 is 342310004342.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 243400013243 - 2¹⁸ = 243399751099 is a prime.

It is not a weakly prime, because it can be changed into another prime (243400019243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121700006621 + 121700006622.

It is an arithmetic number, because the mean of its divisors is an integer number (121700006622).

Almost surely, 2^243400013243 is an apocalyptic number.

243400013243 is a deficient number, since it is larger than the sum of its proper divisors (1).

243400013243 is an equidigital number, since it uses as much as digits as its factorization.

243400013243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 26.

Adding to 243400013243 its reverse (342310004342), we get a palindrome (585710017585).

The spelling of 243400013243 in words is "two hundred forty-three billion, four hundred million, thirteen thousand, two hundred forty-three".