243404003244173 has 2 divisors, whose sum is σ = 243404003244174. Its totient is φ = 243404003244172.

The previous prime is 243404003244139. The next prime is 243404003244293. The reversal of 243404003244173 is 371442300404342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 167694548794249 + 75709454449924 = 12949693^2 + 8701118^2 .

It is a cyclic number.

It is not a de Polignac number, because 243404003244173 - 2¹⁸ = 243404002982029 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 243404003244173.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243404003244673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121702001622086 + 121702001622087.

It is an arithmetic number, because the mean of its divisors is an integer number (121702001622087).

Almost surely, 2^{243404003244173} is an apocalyptic number.

It is an amenable number.

243404003244173 is a deficient number, since it is larger than the sum of its proper divisors (1).

243404003244173 is an equidigital number, since it uses as much as digits as its factorization.

243404003244173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 774144, while the sum is 41.

The spelling of 243404003244173 in words is "two hundred forty-three trillion, four hundred four billion, three million, two hundred forty-four thousand, one hundred seventy-three".