52505209 has 2 divisors, whose sum is σ = 52505210. Its totient is φ = 52505208.

The previous prime is 52505207. The next prime is 52505249. The reversal of 52505209 is 90250525.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26749584 + 25755625 = 5172^2 + 5075^2 .

It is a cyclic number.

It is not a de Polignac number, because 52505209 - 2¹ = 52505207 is a prime.

Together with 52505207, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (52505203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26252604 + 26252605.

It is an arithmetic number, because the mean of its divisors is an integer number (26252605).

Almost surely, 2^52505209 is an apocalyptic number.

It is an amenable number.

52505209 is a deficient number, since it is larger than the sum of its proper divisors (1).

52505209 is an equidigital number, since it uses as much as digits as its factorization.

52505209 is an evil number, because the sum of its binary digits is even.

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

The square root of 52505209 is about 7246.0478193288. The cubic root of 52505209 is about 374.4560029311.

The spelling of 52505209 in words is "fifty-two million, five hundred five thousand, two hundred nine".