243203251573 has 2 divisors, whose sum is σ = 243203251574. Its totient is φ = 243203251572.

The previous prime is 243203251547. The next prime is 243203251597. The reversal of 243203251573 is 375152302342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 187309780849 + 55893470724 = 432793^2 + 236418^2 .

It is a cyclic number.

It is not a de Polignac number, because 243203251573 - 2⁹ = 243203251061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243203251273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121601625786 + 121601625787.

It is an arithmetic number, because the mean of its divisors is an integer number (121601625787).

Almost surely, 2^243203251573 is an apocalyptic number.

It is an amenable number.

243203251573 is a deficient number, since it is larger than the sum of its proper divisors (1).

243203251573 is an equidigital number, since it uses as much as digits as its factorization.

243203251573 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 151200, while the sum is 37.

The spelling of 243203251573 in words is "two hundred forty-three billion, two hundred three million, two hundred fifty-one thousand, five hundred seventy-three".