6554221 has 4 divisors (see below), whose sum is σ = 6899200. Its totient is φ = 6209244.

The previous prime is 6554213. The next prime is 6554239. The reversal of 6554221 is 1224556.

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 6554221 - 2³ = 6554213 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6554201) 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, 172461 + ... + 172498.

It is an arithmetic number, because the mean of its divisors is an integer number (1724800).

Almost surely, 2^6554221 is an apocalyptic number.

It is an amenable number.

6554221 is a deficient number, since it is larger than the sum of its proper divisors (344979).

6554221 is a wasteful number, since it uses less digits than its factorization.

6554221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344978.

The product of its digits is 2400, while the sum is 25.

The square root of 6554221 is about 2560.1212861894. The cubic root of 6554221 is about 187.1430459151.

Adding to 6554221 its reverse (1224556), we get a palindrome (7778777).

The spelling of 6554221 in words is "six million, five hundred fifty-four thousand, two hundred twenty-one".