520265861 has 4 divisors (see below), whose sum is σ = 530082252. Its totient is φ = 510449472.

The previous prime is 520265831. The next prime is 520265881. The reversal of 520265861 is 168562025.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 312617761 + 207648100 = 17681^2 + 14410^2 .

It is a cyclic number.

It is not a de Polignac number, because 520265861 - 2¹⁸ = 520003717 is a prime.

It is a super-2 number, since 2×520265861² = 541353132244142642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520265831) 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 in 3 ways as a sum of consecutive naturals, for example, 4908116 + ... + 4908221.

It is an arithmetic number, because the mean of its divisors is an integer number (132520563).

Almost surely, 2^520265861 is an apocalyptic number.

It is an amenable number.

520265861 is a deficient number, since it is larger than the sum of its proper divisors (9816391).

520265861 is an equidigital number, since it uses as much as digits as its factorization.

520265861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9816390.

The product of its (nonzero) digits is 28800, while the sum is 35.

The square root of 520265861 is about 22809.3371451255. The cubic root of 520265861 is about 804.2821737752.

The spelling of 520265861 in words is "five hundred twenty million, two hundred sixty-five thousand, eight hundred sixty-one".