520781131 has 4 divisors (see below), whose sum is σ = 560841232. Its totient is φ = 480721032.

The previous prime is 520781119. The next prime is 520781137. The reversal of 520781131 is 131187025.

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 520781131 - 2⁵ = 520781099 is a prime.

It is a super-2 number, since 2×520781131² = 542425972811278322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 520781131.

It is not an unprimeable number, because it can be changed into a prime (520781137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20030031 + ... + 20030056.

It is an arithmetic number, because the mean of its divisors is an integer number (140210308).

Almost surely, 2^520781131 is an apocalyptic number.

520781131 is a deficient number, since it is larger than the sum of its proper divisors (40060101).

520781131 is a wasteful number, since it uses less digits than its factorization.

520781131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40060100.

The product of its (nonzero) digits is 1680, while the sum is 28.

The square root of 520781131 is about 22820.6295049019. The cubic root of 520781131 is about 804.5476058473.

The spelling of 520781131 in words is "five hundred twenty million, seven hundred eighty-one thousand, one hundred thirty-one".