6649321 has 4 divisors (see below), whose sum is σ = 7599232. Its totient is φ = 5699412.

The previous prime is 6649319. The next prime is 6649333. The reversal of 6649321 is 1239466.

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 6649321 - 2¹ = 6649319 is a prime.

It is a super-2 number, since 2×6649321² = 88426939522082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6640321) 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, 474945 + ... + 474958.

It is an arithmetic number, because the mean of its divisors is an integer number (1899808).

Almost surely, 2^6649321 is an apocalyptic number.

It is an amenable number.

6649321 is a deficient number, since it is larger than the sum of its proper divisors (949911).

6649321 is an equidigital number, since it uses as much as digits as its factorization.

6649321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 949910.

The product of its digits is 7776, while the sum is 31.

The square root of 6649321 is about 2578.6277358316. The cubic root of 6649321 is about 188.0438350327.

The spelling of 6649321 in words is "six million, six hundred forty-nine thousand, three hundred twenty-one".