520717531 has 4 divisors (see below), whose sum is σ = 551347992. Its totient is φ = 490087072.

The previous prime is 520717517. The next prime is 520717643. The reversal of 520717531 is 135717025.

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 520717531 - 2⁷ = 520717403 is a prime.

It is a super-2 number, since 2×520717531² = 542293494181471922, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 520717493 and 520717502.

It is not an unprimeable number, because it can be changed into a prime (520717031) 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, 15315205 + ... + 15315238.

It is an arithmetic number, because the mean of its divisors is an integer number (137836998).

Almost surely, 2^520717531 is an apocalyptic number.

520717531 is a deficient number, since it is larger than the sum of its proper divisors (30630461).

520717531 is a wasteful number, since it uses less digits than its factorization.

520717531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30630460.

The product of its (nonzero) digits is 7350, while the sum is 31.

The square root of 520717531 is about 22819.2359863340. The cubic root of 520717531 is about 804.5148529255.

The spelling of 520717531 in words is "five hundred twenty million, seven hundred seventeen thousand, five hundred thirty-one".