243043127917819 has 2 divisors, whose sum is σ = 243043127917820. Its totient is φ = 243043127917818.

The previous prime is 243043127917813. The next prime is 243043127917823. The reversal of 243043127917819 is 918719721340342.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 243043127917819 - 2¹⁹ = 243043127393531 is a prime.

It is a super-2 number, since 2×243043127917819² (a number of 30 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (243043127917813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121521563958909 + 121521563958910.

It is an arithmetic number, because the mean of its divisors is an integer number (121521563958910).

Almost surely, 2^{243043127917819} is an apocalyptic number.

243043127917819 is a deficient number, since it is larger than the sum of its proper divisors (1).

243043127917819 is an equidigital number, since it uses as much as digits as its factorization.

243043127917819 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18289152, while the sum is 61.

The spelling of 243043127917819 in words is "two hundred forty-three trillion, forty-three billion, one hundred twenty-seven million, nine hundred seventeen thousand, eight hundred nineteen".