43105439957 has 2 divisors, whose sum is σ = 43105439958. Its totient is φ = 43105439956.

The previous prime is 43105439941. The next prime is 43105440089. The reversal of 43105439957 is 75993450134.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42551025841 + 554414116 = 206279^2 + 23546^2 .

It is a cyclic number.

It is not a de Polignac number, because 43105439957 - 2⁴ = 43105439941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43105430957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21552719978 + 21552719979.

It is an arithmetic number, because the mean of its divisors is an integer number (21552719979).

Almost surely, 2^43105439957 is an apocalyptic number.

It is an amenable number.

43105439957 is a deficient number, since it is larger than the sum of its proper divisors (1).

43105439957 is an equidigital number, since it uses as much as digits as its factorization.

43105439957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2041200, while the sum is 50.

The spelling of 43105439957 in words is "forty-three billion, one hundred five million, four hundred thirty-nine thousand, nine hundred fifty-seven".