1230206209 has 2 divisors, whose sum is σ = 1230206210. Its totient is φ = 1230206208.

The previous prime is 1230206183. The next prime is 1230206231. The reversal of 1230206209 is 9026020321.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 895206400 + 334999809 = 29920^2 + 18303^2 .

It is an emirp because it is prime and its reverse (9026020321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1230206209 - 2⁵ = 1230206177 is a prime.

It is not a weakly prime, because it can be changed into another prime (1230206009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615103104 + 615103105.

It is an arithmetic number, because the mean of its divisors is an integer number (615103105).

Almost surely, 2^1230206209 is an apocalyptic number.

It is an amenable number.

1230206209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1230206209 is an equidigital number, since it uses as much as digits as its factorization.

1230206209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 1230206209 is about 35074.2955595690. The cubic root of 1230206209 is about 1071.5011419095.

The spelling of 1230206209 in words is "one billion, two hundred thirty million, two hundred six thousand, two hundred nine".