43109346809 has 2 divisors, whose sum is σ = 43109346810. Its totient is φ = 43109346808.

The previous prime is 43109346779. The next prime is 43109346823. The reversal of 43109346809 is 90864390134.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24073074025 + 19036272784 = 155155^2 + 137972^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43109346809 is a prime.

It is not a weakly prime, because it can be changed into another prime (43109346869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21554673404 + 21554673405.

It is an arithmetic number, because the mean of its divisors is an integer number (21554673405).

Almost surely, 2^43109346809 is an apocalyptic number.

It is an amenable number.

43109346809 is a deficient number, since it is larger than the sum of its proper divisors (1).

43109346809 is an equidigital number, since it uses as much as digits as its factorization.

43109346809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 559872, while the sum is 47.

The spelling of 43109346809 in words is "forty-three billion, one hundred nine million, three hundred forty-six thousand, eight hundred nine".