243315516439 has 2 divisors, whose sum is σ = 243315516440. Its totient is φ = 243315516438.

The previous prime is 243315516421. The next prime is 243315516449. The reversal of 243315516439 is 934615513342.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243315516439 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243315516449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121657758219 + 121657758220.

It is an arithmetic number, because the mean of its divisors is an integer number (121657758220).

Almost surely, 2^243315516439 is an apocalyptic number.

243315516439 is a deficient number, since it is larger than the sum of its proper divisors (1).

243315516439 is an equidigital number, since it uses as much as digits as its factorization.

243315516439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1166400, while the sum is 46.

The spelling of 243315516439 in words is "two hundred forty-three billion, three hundred fifteen million, five hundred sixteen thousand, four hundred thirty-nine".