320201809 has 2 divisors, whose sum is σ = 320201810. Its totient is φ = 320201808.

The previous prime is 320201807. The next prime is 320201867. The reversal of 320201809 is 908102023.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 317730625 + 2471184 = 17825^2 + 1572^2 .

It is an emirp because it is prime and its reverse (908102023) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 320201809 - 2¹ = 320201807 is a prime.

Together with 320201807, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (320201801) 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, 160100904 + 160100905.

It is an arithmetic number, because the mean of its divisors is an integer number (160100905).

Almost surely, 2^320201809 is an apocalyptic number.

It is an amenable number.

320201809 is a deficient number, since it is larger than the sum of its proper divisors (1).

320201809 is an equidigital number, since it uses as much as digits as its factorization.

320201809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 320201809 is about 17894.1836639731. The cubic root of 320201809 is about 684.1341353446.

The spelling of 320201809 in words is "three hundred twenty million, two hundred one thousand, eight hundred nine".