6540321 has 4 divisors (see below), whose sum is σ = 8720432. Its totient is φ = 4360212.

The previous prime is 6540311. The next prime is 6540323. The reversal of 6540321 is 1230456.

It is a happy number.

6540321 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 Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 6540321 - 2¹³ = 6532129 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6540323) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1090051 + ... + 1090056.

It is an arithmetic number, because the mean of its divisors is an integer number (2180108).

Almost surely, 2^6540321 is an apocalyptic number.

It is an amenable number.

6540321 is a deficient number, since it is larger than the sum of its proper divisors (2180111).

6540321 is a wasteful number, since it uses less digits than its factorization.

6540321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2180110.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 6540321 is about 2557.4051302052. The cubic root of 6540321 is about 187.0106564509.

Adding to 6540321 its reverse (1230456), we get a palindrome (7770777).

The spelling of 6540321 in words is "six million, five hundred forty thousand, three hundred twenty-one".