52520409 has 6 divisors (see below), whose sum is σ = 75862826. Its totient is φ = 35013600.

The previous prime is 52520401. The next prime is 52520423. The reversal of 52520409 is 90402525.

52520409 is a `hidden beast` number, since 5 + 252 + 0 + 409 = 666.

52520409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 43520409 + 9000000 = 6597^2 + 3000^2 .

It is not a de Polignac number, because 52520409 - 2³ = 52520401 is a prime.

It is a super-3 number, since 3×52520409³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (52520401) 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 5 ways as a sum of consecutive naturals, for example, 2917792 + ... + 2917809.

Almost surely, 2^52520409 is an apocalyptic number.

It is an amenable number.

52520409 is a deficient number, since it is larger than the sum of its proper divisors (23342417).

52520409 is a wasteful number, since it uses less digits than its factorization.

52520409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5835607 (or 5835604 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 52520409 is about 7247.0965910494. The cubic root of 52520409 is about 374.4921338357.

The spelling of 52520409 in words is "fifty-two million, five hundred twenty thousand, four hundred nine".