243030019 has 2 divisors, whose sum is σ = 243030020. Its totient is φ = 243030018.

The previous prime is 243030013. The next prime is 243030031. The reversal of 243030019 is 910030342.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243030019 is a prime.

It is a super-2 number, since 2×243030019² = 118127180270280722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (243030013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121515009 + 121515010.

It is an arithmetic number, because the mean of its divisors is an integer number (121515010).

Almost surely, 2^243030019 is an apocalyptic number.

243030019 is a deficient number, since it is larger than the sum of its proper divisors (1).

243030019 is an equidigital number, since it uses as much as digits as its factorization.

243030019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 243030019 is about 15589.4200982589. The cubic root of 243030019 is about 624.0508421687.

The spelling of 243030019 in words is "two hundred forty-three million, thirty thousand, nineteen".