43193819209 has 2 divisors, whose sum is σ = 43193819210. Its totient is φ = 43193819208.

The previous prime is 43193819191. The next prime is 43193819237. The reversal of 43193819209 is 90291839134.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42136593984 + 1057225225 = 205272^2 + 32515^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43193819209 is a prime.

It is not a weakly prime, because it can be changed into another prime (43193819509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21596909604 + 21596909605.

It is an arithmetic number, because the mean of its divisors is an integer number (21596909605).

Almost surely, 2^43193819209 is an apocalyptic number.

It is an amenable number.

43193819209 is a deficient number, since it is larger than the sum of its proper divisors (1).

43193819209 is an equidigital number, since it uses as much as digits as its factorization.

43193819209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 419904, while the sum is 49.

The spelling of 43193819209 in words is "forty-three billion, one hundred ninety-three million, eight hundred nineteen thousand, two hundred nine".