243134343431321 has 2 divisors, whose sum is σ = 243134343431322. Its totient is φ = 243134343431320.

The previous prime is 243134343431267. The next prime is 243134343431393. The reversal of 243134343431321 is 123134343431342.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 187011231792025 + 56123111639296 = 13675205^2 + 7491536^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243134343431321 is a prime.

It is a super-2 number, since 2×243134343431321² (a number of 30 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (243134343131321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121567171715660 + 121567171715661.

It is an arithmetic number, because the mean of its divisors is an integer number (121567171715661).

Almost surely, 2^{243134343431321} is an apocalyptic number.

It is an amenable number.

243134343431321 is a deficient number, since it is larger than the sum of its proper divisors (1).

243134343431321 is an equidigital number, since it uses as much as digits as its factorization.

243134343431321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 746496, while the sum is 41.

Adding to 243134343431321 its reverse (123134343431342), we get a palindrome (366268686862663).

The spelling of 243134343431321 in words is "two hundred forty-three trillion, one hundred thirty-four billion, three hundred forty-three million, four hundred thirty-one thousand, three hundred twenty-one".