320553809 has 2 divisors, whose sum is σ = 320553810. Its totient is φ = 320553808.

The previous prime is 320553773. The next prime is 320553811. The reversal of 320553809 is 908355023.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 299393809 + 21160000 = 17303^2 + 4600^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320553809 is a prime.

Together with 320553811, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (320553839) 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, 160276904 + 160276905.

It is an arithmetic number, because the mean of its divisors is an integer number (160276905).

Almost surely, 2^320553809 is an apocalyptic number.

It is an amenable number.

320553809 is a deficient number, since it is larger than the sum of its proper divisors (1).

320553809 is an equidigital number, since it uses as much as digits as its factorization.

320553809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 320553809 is about 17904.0165605375. The cubic root of 320553809 is about 684.3847346224.

The spelling of 320553809 in words is "three hundred twenty million, five hundred fifty-three thousand, eight hundred nine".