321445 has 8 divisors (see below), whose sum is σ = 393336. Its totient is φ = 252096.

The previous prime is 321443. The next prime is 321449. The reversal of 321445 is 544123.

It can be written as a sum of positive squares in 4 ways, for example, as 6724 + 314721 = 82^2 + 561^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 321445 - 2¹ = 321443 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 (321443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 342 + ... + 871.

It is an arithmetic number, because the mean of its divisors is an integer number (49167).

2³²¹⁴⁴⁵ is an apocalyptic number.

It is an amenable number.

321445 is a deficient number, since it is larger than the sum of its proper divisors (71891).

321445 is a wasteful number, since it uses less digits than its factorization.

321445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1271.

The product of its digits is 480, while the sum is 19.

The square root of 321445 is about 566.9611979668. The cubic root of 321445 is about 68.5018380880.

Adding to 321445 its reverse (544123), we get a palindrome (865568).

It can be divided in two parts, 321 and 445, that multiplied together give a triangular number (142845 = T₅₃₄).

The spelling of 321445 in words is "three hundred twenty-one thousand, four hundred forty-five".