4539221 has 8 divisors (see below), whose sum is σ = 4843800. Its totient is φ = 4238848.

The previous prime is 4539217. The next prime is 4539247. The reversal of 4539221 is 1229354.

It can be written as a sum of positive squares in 4 ways, for example, as 2102500 + 2436721 = 1450^2 + 1561^2 .

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

It is not a de Polignac number, because 4539221 - 2² = 4539217 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 (4539251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1355 + ... + 3303.

It is an arithmetic number, because the mean of its divisors is an integer number (605475).

Almost surely, 2^4539221 is an apocalyptic number.

It is an amenable number.

4539221 is a deficient number, since it is larger than the sum of its proper divisors (304579).

4539221 is a wasteful number, since it uses less digits than its factorization.

4539221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2103.

The product of its digits is 2160, while the sum is 26.

The square root of 4539221 is about 2130.5447660164. The cubic root of 4539221 is about 165.5746233879.

The spelling of 4539221 in words is "four million, five hundred thirty-nine thousand, two hundred twenty-one".