243043019 has 2 divisors, whose sum is σ = 243043020. Its totient is φ = 243043018.

The previous prime is 243042983. The next prime is 243043043. The reversal of 243043019 is 910340342.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 243043019 - 2²⁰ = 241994443 is a prime.

It is a super-2 number, since 2×243043019² = 118139818169268722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (243043819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121521509 + 121521510.

It is an arithmetic number, because the mean of its divisors is an integer number (121521510).

Almost surely, 2^243043019 is an apocalyptic number.

243043019 is a deficient number, since it is larger than the sum of its proper divisors (1).

243043019 is an equidigital number, since it uses as much as digits as its factorization.

243043019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 243043019 is about 15589.8370421246. The cubic root of 243043019 is about 624.0619690744.

The spelling of 243043019 in words is "two hundred forty-three million, forty-three thousand, nineteen".