6491321 has 4 divisors (see below), whose sum is σ = 6496500. Its totient is φ = 6486144.

The previous prime is 6491299. The next prime is 6491333. The reversal of 6491321 is 1231946.

6491321 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1132096 + 5359225 = 1064^2 + 2315^2 .

It is a cyclic number.

It is not a de Polignac number, because 6491321 - 2⁶ = 6491257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6490321) 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 3 ways as a sum of consecutive naturals, for example, 605 + ... + 3653.

It is an arithmetic number, because the mean of its divisors is an integer number (1624125).

Almost surely, 2^6491321 is an apocalyptic number.

It is an amenable number.

6491321 is a deficient number, since it is larger than the sum of its proper divisors (5179).

6491321 is a wasteful number, since it uses less digits than its factorization.

6491321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5178.

The product of its digits is 1296, while the sum is 26.

The square root of 6491321 is about 2547.8070963085. The cubic root of 6491321 is about 186.5424581151.

The spelling of 6491321 in words is "six million, four hundred ninety-one thousand, three hundred twenty-one".