520520911 has 4 divisors (see below), whose sum is σ = 531595872. Its totient is φ = 509445952.

The previous prime is 520520899. The next prime is 520520929. The reversal of 520520911 is 119025025.

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

It is a cyclic number.

It is not a de Polignac number, because 520520911 - 2¹¹ = 520518863 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 (520520711) 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, 5537410 + ... + 5537503.

It is an arithmetic number, because the mean of its divisors is an integer number (132898968).

Almost surely, 2^520520911 is an apocalyptic number.

520520911 is a deficient number, since it is larger than the sum of its proper divisors (11074961).

520520911 is a wasteful number, since it uses less digits than its factorization.

520520911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11074960.

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 520520911 is about 22814.9273722272. The cubic root of 520520911 is about 804.4135800889.

Adding to 520520911 its reverse (119025025), we get a palindrome (639545936).

The spelling of 520520911 in words is "five hundred twenty million, five hundred twenty thousand, nine hundred eleven".