2009321 has 2 divisors, whose sum is σ = 2009322. Its totient is φ = 2009320.

The previous prime is 2009317. The next prime is 2009333. The reversal of 2009321 is 1239002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1125721 + 883600 = 1061^2 + 940^2 .

It is a cyclic number.

It is not a de Polignac number, because 2009321 - 2² = 2009317 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2009321.

It is not a weakly prime, because it can be changed into another prime (2009311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1004660 + 1004661.

It is an arithmetic number, because the mean of its divisors is an integer number (1004661).

2^2009321 is an apocalyptic number.

It is an amenable number.

2009321 is a deficient number, since it is larger than the sum of its proper divisors (1).

2009321 is an equidigital number, since it uses as much as digits as its factorization.

2009321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 2009321 is about 1417.5052028123. The cubic root of 2009321 is about 126.1875304448.

The spelling of 2009321 in words is "two million, nine thousand, three hundred twenty-one".