320613 has 4 divisors (see below), whose sum is σ = 427488. Its totient is φ = 213740.

The previous prime is 320611. The next prime is 320627. The reversal of 320613 is 316023.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 316023 = 3 ⋅105341.

It is a cyclic number.

It is not a de Polignac number, because 320613 - 2¹ = 320611 is a prime.

It is an Ulam number.

It is a D-number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 320592 and 320601.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 320613.

It is not an unprimeable number, because it can be changed into a prime (320611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53433 + ... + 53438.

It is an arithmetic number, because the mean of its divisors is an integer number (106872).

2³²⁰⁶¹³ is an apocalyptic number.

It is an amenable number.

320613 is a deficient number, since it is larger than the sum of its proper divisors (106875).

320613 is a wasteful number, since it uses less digits than its factorization.

320613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106874.

The product of its (nonzero) digits is 108, while the sum is 15.

The square root of 320613 is about 566.2269862873. The cubic root of 320613 is about 68.4426856436.

Adding to 320613 its reverse (316023), we get a palindrome (636636).

The spelling of 320613 in words is "three hundred twenty thousand, six hundred thirteen".