520423531 has 4 divisors (see below), whose sum is σ = 538369200. Its totient is φ = 502477864.

The previous prime is 520423489. The next prime is 520423549. The reversal of 520423531 is 135324025.

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 520423531 - 2¹⁹ = 519899243 is a prime.

It is a super-2 number, since 2×520423531² = 541681303237015922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 520423496 and 520423505.

It is not an unprimeable number, because it can be changed into a prime (520423571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8972791 + ... + 8972848.

It is an arithmetic number, because the mean of its divisors is an integer number (134592300).

Almost surely, 2^520423531 is an apocalyptic number.

520423531 is a deficient number, since it is larger than the sum of its proper divisors (17945669).

520423531 is a wasteful number, since it uses less digits than its factorization.

520423531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17945668.

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 520423531 is about 22812.7931433220. The cubic root of 520423531 is about 804.3634132412.

Adding to 520423531 its reverse (135324025), we get a palindrome (655747556).

The spelling of 520423531 in words is "five hundred twenty million, four hundred twenty-three thousand, five hundred thirty-one".