5643443209 has 2 divisors, whose sum is σ = 5643443210. Its totient is φ = 5643443208.

The previous prime is 5643443171. The next prime is 5643443227. The reversal of 5643443209 is 9023443465.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5446882809 + 196560400 = 73803^2 + 14020^2 .

It is a cyclic number.

It is not a de Polignac number, because 5643443209 - 2²¹ = 5641346057 is a prime.

It is not a weakly prime, because it can be changed into another prime (5643443249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2821721604 + 2821721605.

It is an arithmetic number, because the mean of its divisors is an integer number (2821721605).

Almost surely, 2^5643443209 is an apocalyptic number.

It is an amenable number.

5643443209 is a deficient number, since it is larger than the sum of its proper divisors (1).

5643443209 is an equidigital number, since it uses as much as digits as its factorization.

5643443209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 311040, while the sum is 40.

The square root of 5643443209 is about 75122.8541057913. The cubic root of 5643443209 is about 1780.3882510621.

The spelling of 5643443209 in words is "five billion, six hundred forty-three million, four hundred forty-three thousand, two hundred nine".