648321 has 4 divisors (see below), whose sum is σ = 864432. Its totient is φ = 432212.

The previous prime is 648317. The next prime is 648331. The reversal of 648321 is 123846.

It is a happy number.

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 648321 - 2² = 648317 is a prime.

It is a D-number.

It is a junction number, because it is equal to n+sod(n) for n = 648291 and 648300.

It is not an unprimeable number, because it can be changed into a prime (648331) 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, 108051 + ... + 108056.

It is an arithmetic number, because the mean of its divisors is an integer number (216108).

2⁶⁴⁸³²¹ is an apocalyptic number.

It is an amenable number.

648321 is a deficient number, since it is larger than the sum of its proper divisors (216111).

648321 is a wasteful number, since it uses less digits than its factorization.

648321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216110.

The product of its digits is 1152, while the sum is 24.

The square root of 648321 is about 805.1838299420. The cubic root of 648321 is about 86.5492608137.

It can be divided in two parts, 648 and 321, that added together give a palindrome (969).

The spelling of 648321 in words is "six hundred forty-eight thousand, three hundred twenty-one".