520544521 has 4 divisors (see below), whose sum is σ = 594908032. Its totient is φ = 446181012.

The previous prime is 520544491. The next prime is 520544561. The reversal of 520544521 is 125445025.

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 520544521 - 2¹⁷ = 520413449 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 520544521.

It is not an unprimeable number, because it can be changed into a prime (520544561) 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 3 ways as a sum of consecutive naturals, for example, 37181745 + ... + 37181758.

It is an arithmetic number, because the mean of its divisors is an integer number (148727008).

Almost surely, 2^520544521 is an apocalyptic number.

It is an amenable number.

520544521 is a deficient number, since it is larger than the sum of its proper divisors (74363511).

520544521 is an equidigital number, since it uses as much as digits as its factorization.

520544521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74363510.

The product of its (nonzero) digits is 8000, while the sum is 28.

The square root of 520544521 is about 22815.4447907552. Note that the first 3 decimals coincide. The cubic root of 520544521 is about 804.4257422116.

Adding to 520544521 its reverse (125445025), we get a palindrome (645989546).

The spelling of 520544521 in words is "five hundred twenty million, five hundred forty-four thousand, five hundred twenty-one".