243043321519 has 2 divisors, whose sum is σ = 243043321520. Its totient is φ = 243043321518.

The previous prime is 243043321517. The next prime is 243043321603. The reversal of 243043321519 is 915123340342.

243043321519 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 243043321519 - 2¹ = 243043321517 is a prime.

It is a super-2 number, since 2×243043321519² (a number of 24 digits) contains 22 as substring.

Together with 243043321517, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243043321517) 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, 121521660759 + 121521660760.

It is an arithmetic number, because the mean of its divisors is an integer number (121521660760).

Almost surely, 2^243043321519 is an apocalyptic number.

243043321519 is a deficient number, since it is larger than the sum of its proper divisors (1).

243043321519 is an equidigital number, since it uses as much as digits as its factorization.

243043321519 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 37.

The spelling of 243043321519 in words is "two hundred forty-three billion, forty-three million, three hundred twenty-one thousand, five hundred nineteen".