52521509 has 2 divisors, whose sum is σ = 52521510. Its totient is φ = 52521508.

The previous prime is 52521493. The next prime is 52521559. The reversal of 52521509 is 90512525.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52519009 + 2500 = 7247^2 + 50^2 .

It is a cyclic number.

It is not a de Polignac number, because 52521509 - 2⁴ = 52521493 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (52521559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26260754 + 26260755.

It is an arithmetic number, because the mean of its divisors is an integer number (26260755).

Almost surely, 2^52521509 is an apocalyptic number.

It is an amenable number.

52521509 is a deficient number, since it is larger than the sum of its proper divisors (1).

52521509 is an equidigital number, since it uses as much as digits as its factorization.

52521509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4500, while the sum is 29.

The square root of 52521509 is about 7247.1724831137. The cubic root of 52521509 is about 374.4947483017.

The spelling of 52521509 in words is "fifty-two million, five hundred twenty-one thousand, five hundred nine".