321601 has 4 divisors (see below), whose sum is σ = 367552. Its totient is φ = 275652.

The previous prime is 321593. The next prime is 321611. The reversal of 321601 is 106123.

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.

It is a cyclic number.

It is not a de Polignac number, because 321601 - 2³ = 321593 is a prime.

It is a Duffinian number.

321601 is a lucky 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 pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22965 + ... + 22978.

It is an arithmetic number, because the mean of its divisors is an integer number (91888).

2³²¹⁶⁰¹ is an apocalyptic number.

It is an amenable number.

321601 is a deficient number, since it is larger than the sum of its proper divisors (45951).

321601 is an equidigital number, since it uses as much as digits as its factorization.

321601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45950.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 321601 is about 567.0987568316. The cubic root of 321601 is about 68.5129178046.

Adding to 321601 its reverse (106123), we get a palindrome (427724).

The spelling of 321601 in words is "three hundred twenty-one thousand, six hundred one".