2193209 has 2 divisors, whose sum is σ = 2193210. Its totient is φ = 2193208.

The previous prime is 2193197. The next prime is 2193223. The reversal of 2193209 is 9023912.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2190400 + 2809 = 1480^2 + 53^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2193209 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (2193239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1096604 + 1096605.

It is an arithmetic number, because the mean of its divisors is an integer number (1096605).

2^2193209 is an apocalyptic number.

It is an amenable number.

2193209 is a deficient number, since it is larger than the sum of its proper divisors (1).

2193209 is an equidigital number, since it uses as much as digits as its factorization.

2193209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 2193209 is about 1480.9486824330. The cubic root of 2193209 is about 129.9251837753.

The spelling of 2193209 in words is "two million, one hundred ninety-three thousand, two hundred nine".