52520509 has 4 divisors (see below), whose sum is σ = 53511516. Its totient is φ = 51529504.

The previous prime is 52520483. The next prime is 52520513. The reversal of 52520509 is 90502525.

52520509 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 45941284 + 6579225 = 6778^2 + 2565^2 .

It is a cyclic number.

It is not a de Polignac number, because 52520509 - 2⁷ = 52520381 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 (52520519) 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, 495424 + ... + 495529.

It is an arithmetic number, because the mean of its divisors is an integer number (13377879).

Almost surely, 2^52520509 is an apocalyptic number.

It is an amenable number.

52520509 is a deficient number, since it is larger than the sum of its proper divisors (991007).

52520509 is an equidigital number, since it uses as much as digits as its factorization.

52520509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 991006.

The product of its (nonzero) digits is 4500, while the sum is 28.

The square root of 52520509 is about 7247.1034903608. The cubic root of 52520509 is about 374.4923715160.

The spelling of 52520509 in words is "fifty-two million, five hundred twenty thousand, five hundred nine".