305080309 has 2 divisors, whose sum is σ = 305080310. Its totient is φ = 305080308.

The previous prime is 305080301. The next prime is 305080379. The reversal of 305080309 is 903080503.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 294980625 + 10099684 = 17175^2 + 3178^2 .

It is a cyclic number.

It is not a de Polignac number, because 305080309 - 2³ = 305080301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (305080301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152540154 + 152540155.

It is an arithmetic number, because the mean of its divisors is an integer number (152540155).

Almost surely, 2^305080309 is an apocalyptic number.

It is an amenable number.

305080309 is a deficient number, since it is larger than the sum of its proper divisors (1).

305080309 is an equidigital number, since it uses as much as digits as its factorization.

305080309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 305080309 is about 17466.5482852222. The cubic root of 305080309 is about 673.1906248933.

The spelling of 305080309 in words is "three hundred five million, eighty thousand, three hundred nine".