520313261 has 4 divisors (see below), whose sum is σ = 560337372. Its totient is φ = 480289152.

The previous prime is 520313251. The next prime is 520313293. The reversal of 520313261 is 162313025.

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 79103236 + 441210025 = 8894^2 + 21005^2 .

It is a cyclic number.

It is not a de Polignac number, because 520313261 - 2¹⁰ = 520312237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520313221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20012036 + ... + 20012061.

It is an arithmetic number, because the mean of its divisors is an integer number (140084343).

Almost surely, 2^520313261 is an apocalyptic number.

It is an amenable number.

520313261 is a deficient number, since it is larger than the sum of its proper divisors (40024111).

520313261 is a wasteful number, since it uses less digits than its factorization.

520313261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40024110.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 520313261 is about 22810.3761696295. The cubic root of 520313261 is about 804.3065983500.

Adding to 520313261 its reverse (162313025), we get a palindrome (682626286).

The spelling of 520313261 in words is "five hundred twenty million, three hundred thirteen thousand, two hundred sixty-one".