243203341523 has 2 divisors, whose sum is σ = 243203341524. Its totient is φ = 243203341522.

The previous prime is 243203341499. The next prime is 243203341531. The reversal of 243203341523 is 325143302342.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 243203341523 - 2⁸ = 243203341267 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 243203341523.

It is not a weakly prime, because it can be changed into another prime (243203341583) 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, 121601670761 + 121601670762.

It is an arithmetic number, because the mean of its divisors is an integer number (121601670762).

Almost surely, 2^243203341523 is an apocalyptic number.

243203341523 is a deficient number, since it is larger than the sum of its proper divisors (1).

243203341523 is an equidigital number, since it uses as much as digits as its factorization.

243203341523 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 32.

Adding to 243203341523 its reverse (325143302342), we get a palindrome (568346643865).

The spelling of 243203341523 in words is "two hundred forty-three billion, two hundred three million, three hundred forty-one thousand, five hundred twenty-three".