243747724813 has 2 divisors, whose sum is σ = 243747724814. Its totient is φ = 243747724812.

The previous prime is 243747724789. The next prime is 243747724873. The reversal of 243747724813 is 318427747342.

243747724813 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., 243722904489 + 24820324 = 493683^2 + 4982^2 .

It is a cyclic number.

It is not a de Polignac number, because 243747724813 - 2²¹ = 243745627661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243747724873) 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, 121873862406 + 121873862407.

It is an arithmetic number, because the mean of its divisors is an integer number (121873862407).

Almost surely, 2^243747724813 is an apocalyptic number.

It is an amenable number.

243747724813 is a deficient number, since it is larger than the sum of its proper divisors (1).

243747724813 is an equidigital number, since it uses as much as digits as its factorization.

243747724813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6322176, while the sum is 52.

The spelling of 243747724813 in words is "two hundred forty-three billion, seven hundred forty-seven million, seven hundred twenty-four thousand, eight hundred thirteen".