6685321 has 4 divisors (see below), whose sum is σ = 7037200. Its totient is φ = 6333444.

The previous prime is 6685307. The next prime is 6685331. The reversal of 6685321 is 1235866.

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 6685321 - 2¹³ = 6677129 is a prime.

It is a Duffinian number.

6685321 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6685331) 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, 175911 + ... + 175948.

It is an arithmetic number, because the mean of its divisors is an integer number (1759300).

Almost surely, 2^6685321 is an apocalyptic number.

It is an amenable number.

6685321 is a deficient number, since it is larger than the sum of its proper divisors (351879).

6685321 is a wasteful number, since it uses less digits than its factorization.

6685321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351878.

The product of its digits is 8640, while the sum is 31.

The square root of 6685321 is about 2585.5987701111. The cubic root of 6685321 is about 188.3825862951.

The spelling of 6685321 in words is "six million, six hundred eighty-five thousand, three hundred twenty-one".