1323213209 has 2 divisors, whose sum is σ = 1323213210. Its totient is φ = 1323213208.

The previous prime is 1323213187. The next prime is 1323213233. The reversal of 1323213209 is 9023123231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1060935184 + 262278025 = 32572^2 + 16195^2 .

It is a cyclic number.

It is not a de Polignac number, because 1323213209 - 2²⁰ = 1322164633 is a prime.

It is not a weakly prime, because it can be changed into another prime (1323213289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 661606604 + 661606605.

It is an arithmetic number, because the mean of its divisors is an integer number (661606605).

Almost surely, 2^1323213209 is an apocalyptic number.

It is an amenable number.

1323213209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1323213209 is an equidigital number, since it uses as much as digits as its factorization.

1323213209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 1323213209 is about 36375.9977045304. The cubic root of 1323213209 is about 1097.8506816391.

The spelling of 1323213209 in words is "one billion, three hundred twenty-three million, two hundred thirteen thousand, two hundred nine".