13078309 has 2 divisors, whose sum is σ = 13078310. Its totient is φ = 13078308.

The previous prime is 13078243. The next prime is 13078313. The reversal of 13078309 is 90387031.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8105409 + 4972900 = 2847^2 + 2230^2 .

It is a cyclic number.

It is not a de Polignac number, because 13078309 - 2⁷ = 13078181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13078349) 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, 6539154 + 6539155.

It is an arithmetic number, because the mean of its divisors is an integer number (6539155).

Almost surely, 2^13078309 is an apocalyptic number.

It is an amenable number.

13078309 is a deficient number, since it is larger than the sum of its proper divisors (1).

13078309 is an equidigital number, since it uses as much as digits as its factorization.

13078309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 13078309 is about 3616.3944751645. The cubic root of 13078309 is about 235.6046538495.

The spelling of 13078309 in words is "thirteen million, seventy-eight thousand, three hundred nine".