3123209 has 2 divisors, whose sum is σ = 3123210. Its totient is φ = 3123208.

The previous prime is 3123203. The next prime is 3123217. The reversal of 3123209 is 9023213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1974025 + 1149184 = 1405^2 + 1072^2 .

It is an emirp because it is prime and its reverse (9023213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3123209 - 2⁸ = 3122953 is a prime.

It is not a weakly prime, because it can be changed into another prime (3123203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1561604 + 1561605.

It is an arithmetic number, because the mean of its divisors is an integer number (1561605).

Almost surely, 2^3123209 is an apocalyptic number.

It is an amenable number.

3123209 is a deficient number, since it is larger than the sum of its proper divisors (1).

3123209 is an equidigital number, since it uses as much as digits as its factorization.

3123209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 20.

The square root of 3123209 is about 1767.2603090660. The cubic root of 3123209 is about 146.1729513557.

The spelling of 3123209 in words is "three million, one hundred twenty-three thousand, two hundred nine".