520868129 has 4 divisors (see below), whose sum is σ = 534945684. Its totient is φ = 506790576.

The previous prime is 520868119. The next prime is 520868137. The reversal of 520868129 is 921868025.

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 320589025 + 200279104 = 17905^2 + 14152^2 .

It is a cyclic number.

It is not a de Polignac number, because 520868129 - 2⁸ = 520867873 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (520868119) 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, 7038722 + ... + 7038795.

It is an arithmetic number, because the mean of its divisors is an integer number (133736421).

Almost surely, 2^520868129 is an apocalyptic number.

It is an amenable number.

520868129 is a deficient number, since it is larger than the sum of its proper divisors (14077555).

520868129 is a wasteful number, since it uses less digits than its factorization.

520868129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14077554.

The product of its (nonzero) digits is 69120, while the sum is 41.

The square root of 520868129 is about 22822.5355515114. The cubic root of 520868129 is about 804.5924040240.

It can be divided in two parts, 5208 and 68129, that added together give a palindrome (73337).

The spelling of 520868129 in words is "five hundred twenty million, eight hundred sixty-eight thousand, one hundred twenty-nine".