4491221 has 12 divisors (see below), whose sum is σ = 5270112. Its totient is φ = 3749256.

The previous prime is 4491217. The next prime is 4491241. The reversal of 4491221 is 1221944.

It is not a de Polignac number, because 4491221 - 2² = 4491217 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4491241) 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 11 ways as a sum of consecutive naturals, for example, 12770 + ... + 13116.

It is an arithmetic number, because the mean of its divisors is an integer number (439176).

Almost surely, 2^4491221 is an apocalyptic number.

It is an amenable number.

4491221 is a deficient number, since it is larger than the sum of its proper divisors (778891).

4491221 is an equidigital number, since it uses as much as digits as its factorization.

4491221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 440 (or 397 counting only the distinct ones).

The product of its digits is 576, while the sum is 23.

The square root of 4491221 is about 2119.2501032205. The cubic root of 4491221 is about 164.9889309991.

The spelling of 4491221 in words is "four million, four hundred ninety-one thousand, two hundred twenty-one".