520131609 has 24 divisors (see below), whose sum is σ = 821164032. Its totient is φ = 315826560.

The previous prime is 520131583. The next prime is 520131611. The reversal of 520131609 is 906131025.

520131609 is a `hidden beast` number, since 5 + 20 + 1 + 31 + 609 = 666.

It is not a de Polignac number, because 520131609 - 2⁷ = 520131481 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (520131629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 50089 + ... + 59574.

It is an arithmetic number, because the mean of its divisors is an integer number (34215168).

Almost surely, 2^520131609 is an apocalyptic number.

It is an amenable number.

520131609 is a deficient number, since it is larger than the sum of its proper divisors (301032423).

520131609 is a wasteful number, since it uses less digits than its factorization.

520131609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109717 (or 109714 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 520131609 is about 22806.3940376378. The cubic root of 520131609 is about 804.2129874947.

The spelling of 520131609 in words is "five hundred twenty million, one hundred thirty-one thousand, six hundred nine".