1304321309 has 2 divisors, whose sum is σ = 1304321310. Its totient is φ = 1304321308.

The previous prime is 1304321287. The next prime is 1304321323. The reversal of 1304321309 is 9031234031.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 764688409 + 539632900 = 27653^2 + 23230^2 .

It is an emirp because it is prime and its reverse (9031234031) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1304321309 - 2²⁸ = 1035885853 is a prime.

It is a super-2 number, since 2×1304321309² = 3402508154222946962, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1304321339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 652160654 + 652160655.

It is an arithmetic number, because the mean of its divisors is an integer number (652160655).

Almost surely, 2^1304321309 is an apocalyptic number.

It is an amenable number.

1304321309 is a deficient number, since it is larger than the sum of its proper divisors (1).

1304321309 is an equidigital number, since it uses as much as digits as its factorization.

1304321309 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 1304321309 is about 36115.3888114194. The cubic root of 1304321309 is about 1092.6008394162.

The spelling of 1304321309 in words is "one billion, three hundred four million, three hundred twenty-one thousand, three hundred nine".