520615625 has 12 divisors (see below), whose sum is σ = 650731788. Its totient is φ = 416490000.

The previous prime is 520615621. The next prime is 520615651. The reversal of 520615625 is 526516025.

It can be written as a sum of positive squares in 6 ways, for example, as 349241344 + 171374281 = 18688^2 + 13091^2 .

It is not a de Polignac number, because 520615625 - 2² = 520615621 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 520615591 and 520615600.

It is not an unprimeable number, because it can be changed into a prime (520615621) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 80174 + ... + 86423.

It is an arithmetic number, because the mean of its divisors is an integer number (54227649).

Almost surely, 2^520615625 is an apocalyptic number.

It is an amenable number.

520615625 is a deficient number, since it is larger than the sum of its proper divisors (130116163).

520615625 is an frugal number, since it uses more digits than its factorization.

520615625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166622 (or 166602 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 32.

The square root of 520615625 is about 22817.0029802338. The cubic root of 520615625 is about 804.4623675027.

The spelling of 520615625 in words is "five hundred twenty million, six hundred fifteen thousand, six hundred twenty-five".