320209 has 2 divisors, whose sum is σ = 320210. Its totient is φ = 320208.

The previous prime is 320179. The next prime is 320213. The reversal of 320209 is 902023.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 305809 + 14400 = 553^2 + 120^2 .

It is a cyclic number.

It is not a de Polignac number, because 320209 - 2⁷ = 320081 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 320192 and 320201.

It is not a weakly prime, because it can be changed into another prime (320219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160104 + 160105.

It is an arithmetic number, because the mean of its divisors is an integer number (160105).

2³²⁰²⁰⁹ is an apocalyptic number.

It is an amenable number.

320209 is a deficient number, since it is larger than the sum of its proper divisors (1).

320209 is an equidigital number, since it uses as much as digits as its factorization.

320209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 320209 is about 565.8701264425. The cubic root of 320209 is about 68.4139256669.

It can be divided in two parts, 320 and 209, that added together give a square (529 = 23²).

The spelling of 320209 in words is "three hundred twenty thousand, two hundred nine".