243043321603 has 2 divisors, whose sum is σ = 243043321604. Its totient is φ = 243043321602.

The previous prime is 243043321519. The next prime is 243043321607. The reversal of 243043321603 is 306123340342.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 243043321603 - 2¹⁷ = 243043190531 is a prime.

It is not a weakly prime, because it can be changed into another prime (243043321607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121521660801 + 121521660802.

It is an arithmetic number, because the mean of its divisors is an integer number (121521660802).

Almost surely, 2^243043321603 is an apocalyptic number.

243043321603 is a deficient number, since it is larger than the sum of its proper divisors (1).

243043321603 is an equidigital number, since it uses as much as digits as its factorization.

243043321603 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 31.

Adding to 243043321603 its reverse (306123340342), we get a palindrome (549166661945).

The spelling of 243043321603 in words is "two hundred forty-three billion, forty-three million, three hundred twenty-one thousand, six hundred three".