320609 has 2 divisors, whose sum is σ = 320610. Its totient is φ = 320608.

The previous prime is 320591. The next prime is 320611. The reversal of 320609 is 906023.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 253009 + 67600 = 503^2 + 260^2 .

It is an emirp because it is prime and its reverse (906023) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320609 is a prime.

Together with 320611, it forms a pair of twin primes.

It is a Chen prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 320609.

It is not a weakly prime, because it can be changed into another prime (320659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160304 + 160305.

It is an arithmetic number, because the mean of its divisors is an integer number (160305).

2³²⁰⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

320609 is a deficient number, since it is larger than the sum of its proper divisors (1).

320609 is an equidigital number, since it uses as much as digits as its factorization.

320609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 20.

The square root of 320609 is about 566.2234541239. The cubic root of 320609 is about 68.4424010098.

It can be divided in two parts, 320 and 609, that added together give a palindrome (929).

The spelling of 320609 in words is "three hundred twenty thousand, six hundred nine".