520355531 has 12 divisors (see below), whose sum is σ = 538599600. Its totient is φ = 502696800.

The previous prime is 520355509. The next prime is 520355543. The reversal of 520355531 is 135553025.

It is a de Polignac number, because none of the positive numbers 2^k-520355531 is a prime.

It is a super-2 number, since 2×520355531² = 541539757284583922, 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 = 520355494 and 520355503.

It is not an unprimeable number, because it can be changed into a prime (520055531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 202706 + ... + 205256.

It is an arithmetic number, because the mean of its divisors is an integer number (44883300).

Almost surely, 2^520355531 is an apocalyptic number.

520355531 is a deficient number, since it is larger than the sum of its proper divisors (18244069).

520355531 is a wasteful number, since it uses less digits than its factorization.

520355531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2774 (or 2737 counting only the distinct ones).

The product of its (nonzero) digits is 11250, while the sum is 29.

The square root of 520355531 is about 22811.3027028269. The cubic root of 520355531 is about 804.3283782544.

The spelling of 520355531 in words is "five hundred twenty million, three hundred fifty-five thousand, five hundred thirty-one".