320809613 has 2 divisors, whose sum is σ = 320809614. Its totient is φ = 320809612.

The previous prime is 320809579. The next prime is 320809693. The reversal of 320809613 is 316908023.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 243422404 + 77387209 = 15602^2 + 8797^2 .

It is a cyclic number.

It is not a de Polignac number, because 320809613 - 2¹⁰ = 320808589 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 320809613.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320809693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160404806 + 160404807.

It is an arithmetic number, because the mean of its divisors is an integer number (160404807).

Almost surely, 2^320809613 is an apocalyptic number.

It is an amenable number.

320809613 is a deficient number, since it is larger than the sum of its proper divisors (1).

320809613 is an equidigital number, since it uses as much as digits as its factorization.

320809613 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 320809613 is about 17911.1588960625. The cubic root of 320809613 is about 684.5667340245.

The spelling of 320809613 in words is "three hundred twenty million, eight hundred nine thousand, six hundred thirteen".