43105204309 has 2 divisors, whose sum is σ = 43105204310. Its totient is φ = 43105204308.

The previous prime is 43105204213. The next prime is 43105204321. The reversal of 43105204309 is 90340250134.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42816714084 + 288490225 = 206922^2 + 16985^2 .

It is a cyclic number.

It is not a de Polignac number, because 43105204309 - 2⁹ = 43105203797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43105204349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21552602154 + 21552602155.

It is an arithmetic number, because the mean of its divisors is an integer number (21552602155).

Almost surely, 2^43105204309 is an apocalyptic number.

It is an amenable number.

43105204309 is a deficient number, since it is larger than the sum of its proper divisors (1).

43105204309 is an equidigital number, since it uses as much as digits as its factorization.

43105204309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 31.

The spelling of 43105204309 in words is "forty-three billion, one hundred five million, two hundred four thousand, three hundred nine".