243120454019 has 2 divisors, whose sum is σ = 243120454020. Its totient is φ = 243120454018.

The previous prime is 243120454013. The next prime is 243120454039. The reversal of 243120454019 is 910454021342.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 243120454019 - 2²⁰ = 243119405443 is a prime.

It is a super-2 number, since 2×243120454019² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 243120454019.

It is not a weakly prime, because it can be changed into another prime (243120454013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121560227009 + 121560227010.

It is an arithmetic number, because the mean of its divisors is an integer number (121560227010).

Almost surely, 2^243120454019 is an apocalyptic number.

243120454019 is a deficient number, since it is larger than the sum of its proper divisors (1).

243120454019 is an equidigital number, since it uses as much as digits as its factorization.

243120454019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34560, while the sum is 35.

The spelling of 243120454019 in words is "two hundred forty-three billion, one hundred twenty million, four hundred fifty-four thousand, nineteen".