520523261 has 4 divisors (see below), whose sum is σ = 531598272. Its totient is φ = 509448252.

The previous prime is 520523231. The next prime is 520523273. The reversal of 520523261 is 162325025.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 520523261 - 2⁶ = 520523197 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 520523261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520523231) 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, 5537435 + ... + 5537528.

It is an arithmetic number, because the mean of its divisors is an integer number (132899568).

Almost surely, 2^520523261 is an apocalyptic number.

It is an amenable number.

520523261 is a deficient number, since it is larger than the sum of its proper divisors (11075011).

520523261 is a wasteful number, since it uses less digits than its factorization.

520523261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11075010.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 520523261 is about 22814.9788735383. The cubic root of 520523261 is about 804.4147906513.

Adding to 520523261 its reverse (162325025), we get a palindrome (682848286).

The spelling of 520523261 in words is "five hundred twenty million, five hundred twenty-three thousand, two hundred sixty-one".