4528221 has 4 divisors (see below), whose sum is σ = 6037632. Its totient is φ = 3018812.

The previous prime is 4528219. The next prime is 4528229. The reversal of 4528221 is 1228254.

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 4528221 - 2¹ = 4528219 is a prime.

It is a D-number.

4528221 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 4528191 and 4528200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4528229) 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, 754701 + ... + 754706.

It is an arithmetic number, because the mean of its divisors is an integer number (1509408).

Almost surely, 2^4528221 is an apocalyptic number.

It is an amenable number.

4528221 is a deficient number, since it is larger than the sum of its proper divisors (1509411).

4528221 is a wasteful number, since it uses less digits than its factorization.

4528221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1509410.

The product of its digits is 1280, while the sum is 24.

The square root of 4528221 is about 2127.9617007832. The cubic root of 4528221 is about 165.4407682574.

The spelling of 4528221 in words is "four million, five hundred twenty-eight thousand, two hundred twenty-one".