43043385251813 has 2 divisors, whose sum is σ = 43043385251814. Its totient is φ = 43043385251812.

The previous prime is 43043385251759. The next prime is 43043385251837. The reversal of 43043385251813 is 31815258334034.

43043385251813 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., 27487444665409 + 15555940586404 = 5242847^2 + 3944102^2 .

It is a cyclic number.

It is not a de Polignac number, because 43043385251813 - 2³⁸ = 42768507344869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43043385250813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21521692625906 + 21521692625907.

It is an arithmetic number, because the mean of its divisors is an integer number (21521692625907).

Almost surely, 2^{43043385251813} is an apocalyptic number.

It is an amenable number.

43043385251813 is a deficient number, since it is larger than the sum of its proper divisors (1).

43043385251813 is an equidigital number, since it uses as much as digits as its factorization.

43043385251813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4147200, while the sum is 50.

The spelling of 43043385251813 in words is "forty-three trillion, forty-three billion, three hundred eighty-five million, two hundred fifty-one thousand, eight hundred thirteen".