520709825 has 6 divisors (see below), whose sum is σ = 645680214. Its totient is φ = 416567840.

The previous prime is 520709807. The next prime is 520709831. The reversal of 520709825 is 528907025.

It can be written as a sum of positive squares in 3 ways, for example, as 119749249 + 400960576 = 10943^2 + 20024^2 .

It is not a de Polignac number, because 520709825 - 2²⁰ = 519661249 is a prime.

It is a super-2 number, since 2×520709825² = 542277443703061250, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10414172 + ... + 10414221.

It is an arithmetic number, because the mean of its divisors is an integer number (107613369).

Almost surely, 2^520709825 is an apocalyptic number.

It is an amenable number.

520709825 is a deficient number, since it is larger than the sum of its proper divisors (124970389).

520709825 is a wasteful number, since it uses less digits than its factorization.

520709825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20828403 (or 20828398 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 38.

The square root of 520709825 is about 22819.0671369362. The cubic root of 520709825 is about 804.5108842851.

The spelling of 520709825 in words is "five hundred twenty million, seven hundred nine thousand, eight hundred twenty-five".