213344809 has 2 divisors, whose sum is σ = 213344810. Its totient is φ = 213344808.

The previous prime is 213344779. The next prime is 213344861. The reversal of 213344809 is 908443312.

213344809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 134490409 + 78854400 = 11597^2 + 8880^2 .

It is a cyclic number.

It is not a de Polignac number, because 213344809 - 2²³ = 204956201 is a prime.

It is not a weakly prime, because it can be changed into another prime (213341809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106672404 + 106672405.

It is an arithmetic number, because the mean of its divisors is an integer number (106672405).

Almost surely, 2^213344809 is an apocalyptic number.

It is an amenable number.

213344809 is a deficient number, since it is larger than the sum of its proper divisors (1).

213344809 is an equidigital number, since it uses as much as digits as its factorization.

213344809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 213344809 is about 14606.3277041151. The cubic root of 213344809 is about 597.5313466628.

The spelling of 213344809 in words is "two hundred thirteen million, three hundred forty-four thousand, eight hundred nine".