520525209 has 8 divisors (see below), whose sum is σ = 694216480. Its totient is φ = 346925376.

The previous prime is 520525189. The next prime is 520525219. The reversal of 520525209 is 902525025.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 520525209 - 2⁵ = 520525177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (520525219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8239 + ... + 33300.

It is an arithmetic number, because the mean of its divisors is an integer number (86777060).

Almost surely, 2^520525209 is an apocalyptic number.

It is an amenable number.

520525209 is a deficient number, since it is larger than the sum of its proper divisors (173691271).

520525209 is a wasteful number, since it uses less digits than its factorization.

520525209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45719.

The product of its (nonzero) digits is 9000, while the sum is 30.

The square root of 520525209 is about 22815.0215647498. The cubic root of 520525209 is about 804.4157941275.

The spelling of 520525209 in words is "five hundred twenty million, five hundred twenty-five thousand, two hundred nine".