321613 has 4 divisors (see below), whose sum is σ = 338560. Its totient is φ = 304668.

The previous prime is 321611. The next prime is 321617. The reversal of 321613 is 316123.

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: 316123 = 97 ⋅3259.

It is a cyclic number.

It is not a de Polignac number, because 321613 - 2¹ = 321611 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321611) 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, 8445 + ... + 8482.

It is an arithmetic number, because the mean of its divisors is an integer number (84640).

2³²¹⁶¹³ is an apocalyptic number.

It is an amenable number.

321613 is a deficient number, since it is larger than the sum of its proper divisors (16947).

321613 is a wasteful number, since it uses less digits than its factorization.

321613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16946.

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

The square root of 321613 is about 567.1093369007. The cubic root of 321613 is about 68.5137699421.

Adding to 321613 its reverse (316123), we get a palindrome (637736).

The spelling of 321613 in words is "three hundred twenty-one thousand, six hundred thirteen".