4511221 has 8 divisors (see below), whose sum is σ = 5300064. Its totient is φ = 3785520.

The previous prime is 4511219. The next prime is 4511231. The reversal of 4511221 is 1221154.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 4511221 - 2¹ = 4511219 is a prime.

It is a super-2 number, since 2×4511221² = 40702229821682, which contains 22 as substring.

4511221 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 4511195 and 4511204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4511231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15631 + ... + 15916.

It is an arithmetic number, because the mean of its divisors is an integer number (662508).

Almost surely, 2^4511221 is an apocalyptic number.

It is an amenable number.

4511221 is a deficient number, since it is larger than the sum of its proper divisors (788843).

4511221 is a wasteful number, since it uses less digits than its factorization.

4511221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31571.

The product of its digits is 80, while the sum is 16.

The square root of 4511221 is about 2123.9635119276. The cubic root of 4511221 is about 165.2334741931.

Adding to 4511221 its reverse (1221154), we get a palindrome (5732375).

It can be divided in two parts, 4 and 511221, that added together give a square (511225 = 715²).

The spelling of 4511221 in words is "four million, five hundred eleven thousand, two hundred twenty-one".