2321309 has 2 divisors, whose sum is σ = 2321310. Its totient is φ = 2321308.

The previous prime is 2321281. The next prime is 2321317. The reversal of 2321309 is 9031232.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2280100 + 41209 = 1510^2 + 203^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2321309 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2321329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1160654 + 1160655.

It is an arithmetic number, because the mean of its divisors is an integer number (1160655).

2^2321309 is an apocalyptic number.

It is an amenable number.

2321309 is a deficient number, since it is larger than the sum of its proper divisors (1).

2321309 is an equidigital number, since it uses as much as digits as its factorization.

2321309 is an odious number, because the sum of its binary digits is odd.

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

The square root of 2321309 is about 1523.5842608796. The cubic root of 2321309 is about 132.4070120083.

The spelling of 2321309 in words is "two million, three hundred twenty-one thousand, three hundred nine".