243121134437 has 2 divisors, whose sum is σ = 243121134438. Its totient is φ = 243121134436.

The previous prime is 243121134419. The next prime is 243121134463. The reversal of 243121134437 is 734431121342.

243121134437 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 242330737441 + 790396996 = 492271^2 + 28114^2 .

It is a cyclic number.

It is not a de Polignac number, because 243121134437 - 2⁸ = 243121134181 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 243121134397 and 243121134406.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243121134337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121560567218 + 121560567219.

It is an arithmetic number, because the mean of its divisors is an integer number (121560567219).

Almost surely, 2^243121134437 is an apocalyptic number.

It is an amenable number.

243121134437 is a deficient number, since it is larger than the sum of its proper divisors (1).

243121134437 is an equidigital number, since it uses as much as digits as its factorization.

243121134437 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 35.

Adding to 243121134437 its reverse (734431121342), we get a palindrome (977552255779).

The spelling of 243121134437 in words is "two hundred forty-three billion, one hundred twenty-one million, one hundred thirty-four thousand, four hundred thirty-seven".