4521209 has 16 divisors (see below), whose sum is σ = 5723136. Its totient is φ = 3469200.

The previous prime is 4521173. The next prime is 4521217. The reversal of 4521209 is 9021254.

It is not a de Polignac number, because 4521209 - 2¹² = 4517113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4521299) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5054 + ... + 5880.

It is an arithmetic number, because the mean of its divisors is an integer number (357696).

Almost surely, 2^4521209 is an apocalyptic number.

It is an amenable number.

4521209 is a deficient number, since it is larger than the sum of its proper divisors (1201927).

4521209 is a wasteful number, since it uses less digits than its factorization.

4521209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 916.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 4521209 is about 2126.3134764188. The cubic root of 4521209 is about 165.3553285246.

It can be divided in two parts, 452 and 1209, that added together give a palindrome (1661).

The spelling of 4521209 in words is "four million, five hundred twenty-one thousand, two hundred nine".