243431398019 has 2 divisors, whose sum is σ = 243431398020. Its totient is φ = 243431398018.

The previous prime is 243431398013. The next prime is 243431398061. The reversal of 243431398019 is 910893134342.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 243431398019 - 2⁸ = 243431397763 is a prime.

It is a super-2 number, since 2×243431398019² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (243431398013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121715699009 + 121715699010.

It is an arithmetic number, because the mean of its divisors is an integer number (121715699010).

Almost surely, 2^243431398019 is an apocalyptic number.

243431398019 is a deficient number, since it is larger than the sum of its proper divisors (1).

243431398019 is an equidigital number, since it uses as much as digits as its factorization.

243431398019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 559872, while the sum is 47.

The spelling of 243431398019 in words is "two hundred forty-three billion, four hundred thirty-one million, three hundred ninety-eight thousand, nineteen".