43540000043 has 2 divisors, whose sum is σ = 43540000044. Its totient is φ = 43540000042.

The previous prime is 43539999989. The next prime is 43540000067. The reversal of 43540000043 is 34000004534.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43540000043 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 43539999973 and 43540000018.

It is not a weakly prime, because it can be changed into another prime (43540000093) 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, 21770000021 + 21770000022.

It is an arithmetic number, because the mean of its divisors is an integer number (21770000022).

Almost surely, 2^43540000043 is an apocalyptic number.

43540000043 is a deficient number, since it is larger than the sum of its proper divisors (1).

43540000043 is an equidigital number, since it uses as much as digits as its factorization.

43540000043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 23.

Adding to 43540000043 its reverse (34000004534), we get a palindrome (77540004577).

The spelling of 43540000043 in words is "forty-three billion, five hundred forty million, forty-three", and thus it is an aban number.