52521009 has 4 divisors (see below), whose sum is σ = 70028016. Its totient is φ = 35014004.

The previous prime is 52520981. The next prime is 52521047. The reversal of 52521009 is 90012525.

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 52521009 - 2²⁰ = 51472433 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 52521009.

It is not an unprimeable number, because it can be changed into a prime (52521509) 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, 8753499 + ... + 8753504.

It is an arithmetic number, because the mean of its divisors is an integer number (17507004).

Almost surely, 2^52521009 is an apocalyptic number.

It is an amenable number.

52521009 is a deficient number, since it is larger than the sum of its proper divisors (17507007).

52521009 is a wasteful number, since it uses less digits than its factorization.

52521009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17507006.

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 52521009 is about 7247.1379868193. The cubic root of 52521009 is about 374.4935599126.

The spelling of 52521009 in words is "fifty-two million, five hundred twenty-one thousand, nine".