4565521 has 4 divisors (see below), whose sum is σ = 4571172. Its totient is φ = 4559872.

The previous prime is 4565501. The next prime is 4565543. The reversal of 4565521 is 1255654.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4326400 + 239121 = 2080^2 + 489^2 .

It is a cyclic number.

It is not a de Polignac number, because 4565521 - 2¹⁷ = 4434449 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 4565521.

It is not an unprimeable number, because it can be changed into a prime (4565501) 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, 1360 + ... + 3313.

It is an arithmetic number, because the mean of its divisors is an integer number (1142793).

Almost surely, 2^4565521 is an apocalyptic number.

It is an amenable number.

4565521 is a deficient number, since it is larger than the sum of its proper divisors (5651).

4565521 is an equidigital number, since it uses as much as digits as its factorization.

4565521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5650.

The product of its digits is 6000, while the sum is 28.

The square root of 4565521 is about 2136.7079819199. The cubic root of 4565521 is about 165.8937845709.

The spelling of 4565521 in words is "four million, five hundred sixty-five thousand, five hundred twenty-one".