1230203209 has 2 divisors, whose sum is σ = 1230203210. Its totient is φ = 1230203208.

The previous prime is 1230203201. The next prime is 1230203291. The reversal of 1230203209 is 9023020321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1127079184 + 103124025 = 33572^2 + 10155^2 .

It is a cyclic number.

It is not a de Polignac number, because 1230203209 - 2³ = 1230203201 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1230203209.

It is not a weakly prime, because it can be changed into another prime (1230203201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615101604 + 615101605.

It is an arithmetic number, because the mean of its divisors is an integer number (615101605).

Almost surely, 2^1230203209 is an apocalyptic number.

It is an amenable number.

1230203209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1230203209 is an equidigital number, since it uses as much as digits as its factorization.

1230203209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 1230203209 is about 35074.2527931815. The cubic root of 1230203209 is about 1071.5002709157.

The spelling of 1230203209 in words is "one billion, two hundred thirty million, two hundred three thousand, two hundred nine".