43534920809 has 2 divisors, whose sum is σ = 43534920810. Its totient is φ = 43534920808.

The previous prime is 43534920739. The next prime is 43534920859. The reversal of 43534920809 is 90802943534.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28271059600 + 15263861209 = 168140^2 + 123547^2 .

It is a cyclic number.

It is not a de Polignac number, because 43534920809 - 2¹² = 43534916713 is a prime.

It is not a weakly prime, because it can be changed into another prime (43534920859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21767460404 + 21767460405.

It is an arithmetic number, because the mean of its divisors is an integer number (21767460405).

Almost surely, 2^43534920809 is an apocalyptic number.

It is an amenable number.

43534920809 is a deficient number, since it is larger than the sum of its proper divisors (1).

43534920809 is an equidigital number, since it uses as much as digits as its factorization.

43534920809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 933120, while the sum is 47.

The spelling of 43534920809 in words is "forty-three billion, five hundred thirty-four million, nine hundred twenty thousand, eight hundred nine".