6694221 has 4 divisors (see below), whose sum is σ = 8925632. Its totient is φ = 4462812.

The previous prime is 6694217. The next prime is 6694229. The reversal of 6694221 is 1224966.

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 6694221 - 2² = 6694217 is a prime.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6694229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1115701 + ... + 1115706.

It is an arithmetic number, because the mean of its divisors is an integer number (2231408).

Almost surely, 2^6694221 is an apocalyptic number.

It is an amenable number.

6694221 is a deficient number, since it is larger than the sum of its proper divisors (2231411).

6694221 is a wasteful number, since it uses less digits than its factorization.

6694221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2231410.

The product of its digits is 5184, while the sum is 30.

The square root of 6694221 is about 2587.3192690505. The cubic root of 6694221 is about 188.4661455617.

The spelling of 6694221 in words is "six million, six hundred ninety-four thousand, two hundred twenty-one".