3281209 has 2 divisors, whose sum is σ = 3281210. Its totient is φ = 3281208.

The previous prime is 3281207. The next prime is 3281233. The reversal of 3281209 is 9021823.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3240000 + 41209 = 1800^2 + 203^2 .

It is a cyclic number.

It is not a de Polignac number, because 3281209 - 2¹ = 3281207 is a prime.

Together with 3281207, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (3281207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1640604 + 1640605.

It is an arithmetic number, because the mean of its divisors is an integer number (1640605).

Almost surely, 2^3281209 is an apocalyptic number.

It is an amenable number.

3281209 is a deficient number, since it is larger than the sum of its proper divisors (1).

3281209 is an equidigital number, since it uses as much as digits as its factorization.

3281209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 3281209 is about 1811.4107761632. The cubic root of 3281209 is about 148.5974298938.

The spelling of 3281209 in words is "three million, two hundred eighty-one thousand, two hundred nine".