Adding to 321613 its reverse (316123), we get a palindrome (637736).
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 a Duffinian number.
It is a congruent number.
2321613 is an apocalyptic number.
It is an amenable number.
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 square root of 321613 is about 567.1093369007. The cubic root of 321613 is about 68.5137699421.
The spelling of 321613 in words is "three hundred twenty-one thousand, six hundred thirteen".