6531321 has 8 divisors (see below), whose sum is σ = 8731360. Its totient is φ = 4342752.

The previous prime is 6531319. The next prime is 6531323. The reversal of 6531321 is 1231356.

It is an interprime number because it is at equal distance from previous prime (6531319) and next prime (6531323).

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

It is not a de Polignac number, because 6531321 - 2¹ = 6531319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6531323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1435 + ... + 3888.

It is an arithmetic number, because the mean of its divisors is an integer number (1091420).

Almost surely, 2^6531321 is an apocalyptic number.

It is an amenable number.

6531321 is a deficient number, since it is larger than the sum of its proper divisors (2200039).

6531321 is a wasteful number, since it uses less digits than its factorization.

6531321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5735.

The product of its digits is 540, while the sum is 21.

The square root of 6531321 is about 2555.6449283889. The cubic root of 6531321 is about 186.9248365794.

Adding to 6531321 its reverse (1231356), we get a palindrome (7762677).

The spelling of 6531321 in words is "six million, five hundred thirty-one thousand, three hundred twenty-one".