43442431013 has 2 divisors, whose sum is σ = 43442431014. Its totient is φ = 43442431012.

The previous prime is 43442430991. The next prime is 43442431133. The reversal of 43442431013 is 31013424434.

It is a happy number.

43442431013 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., 32689363204 + 10753067809 = 180802^2 + 103697^2 .

It is a cyclic number.

It is not a de Polignac number, because 43442431013 - 2⁶ = 43442430949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43442431913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21721215506 + 21721215507.

It is an arithmetic number, because the mean of its divisors is an integer number (21721215507).

Almost surely, 2^43442431013 is an apocalyptic number.

It is an amenable number.

43442431013 is a deficient number, since it is larger than the sum of its proper divisors (1).

43442431013 is an equidigital number, since it uses as much as digits as its factorization.

43442431013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 29.

Adding to 43442431013 its reverse (31013424434), we get a palindrome (74455855447).

The spelling of 43442431013 in words is "forty-three billion, four hundred forty-two million, four hundred thirty-one thousand, thirteen".