520530511 has 4 divisors (see below), whose sum is σ = 522803800. Its totient is φ = 518257224.

The previous prime is 520530487. The next prime is 520530529. The reversal of 520530511 is 115035025.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-520530511 is a prime.

It is a super-2 number, since 2×520530511² = 541904025763842242, 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 (520530011) 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, 1136301 + ... + 1136758.

It is an arithmetic number, because the mean of its divisors is an integer number (130700950).

Almost surely, 2^520530511 is an apocalyptic number.

520530511 is a deficient number, since it is larger than the sum of its proper divisors (2273289).

520530511 is a wasteful number, since it uses less digits than its factorization.

520530511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2273288.

The product of its (nonzero) digits is 750, while the sum is 22.

The square root of 520530511 is about 22815.1377598295. The cubic root of 520530511 is about 804.4185253420.

Adding to 520530511 its reverse (115035025), we get a palindrome (635565536).

The spelling of 520530511 in words is "five hundred twenty million, five hundred thirty thousand, five hundred eleven".