1206209 has 2 divisors, whose sum is σ = 1206210. Its totient is φ = 1206208.

The previous prime is 1206199. The next prime is 1206223. The reversal of 1206209 is 9026021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1081600 + 124609 = 1040^2 + 353^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1206209 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1206229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 603104 + 603105.

It is an arithmetic number, because the mean of its divisors is an integer number (603105).

2^1206209 is an apocalyptic number.

It is an amenable number.

1206209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1206209 is an equidigital number, since it uses as much as digits as its factorization.

1206209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 1206209 is about 1098.2754663562. The cubic root of 1206209 is about 106.4488208032.

The spelling of 1206209 in words is "one million, two hundred six thousand, two hundred nine".