243121234537 has 2 divisors, whose sum is σ = 243121234538. Its totient is φ = 243121234536.

The previous prime is 243121234507. The next prime is 243121234541. The reversal of 243121234537 is 735432121342.

243121234537 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 243112108096 + 9126441 = 493064^2 + 3021^2 .

It is a cyclic number.

It is not a de Polignac number, because 243121234537 - 2²⁷ = 242987016809 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 243121234496 and 243121234505.

It is not a weakly prime, because it can be changed into another prime (243121234507) 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, 121560617268 + 121560617269.

It is an arithmetic number, because the mean of its divisors is an integer number (121560617269).

Almost surely, 2^243121234537 is an apocalyptic number.

It is an amenable number.

243121234537 is a deficient number, since it is larger than the sum of its proper divisors (1).

243121234537 is an equidigital number, since it uses as much as digits as its factorization.

243121234537 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120960, while the sum is 37.

Adding to 243121234537 its reverse (735432121342), we get a palindrome (978553355879).

The spelling of 243121234537 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred thirty-four thousand, five hundred thirty-seven".