520131521 has 24 divisors (see below), whose sum is σ = 653313024. Its totient is φ = 410447520.

The previous prime is 520131509. The next prime is 520131527. The reversal of 520131521 is 125131025.

It is a happy number.

It is not a de Polignac number, because 520131521 - 2¹⁴ = 520115137 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 520131493 and 520131502.

It is not an unprimeable number, because it can be changed into a prime (520131527) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 311936 + ... + 313598.

It is an arithmetic number, because the mean of its divisors is an integer number (27221376).

Almost surely, 2^520131521 is an apocalyptic number.

It is an amenable number.

520131521 is a deficient number, since it is larger than the sum of its proper divisors (133181503).

520131521 is a wasteful number, since it uses less digits than its factorization.

520131521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2181 (or 2174 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 520131521 is about 22806.3921083542. The cubic root of 520131521 is about 804.2129421403.

Adding to 520131521 its reverse (125131025), we get a palindrome (645262546).

The spelling of 520131521 in words is "five hundred twenty million, one hundred thirty-one thousand, five hundred twenty-one".