520505581 has 2 divisors, whose sum is σ = 520505582. Its totient is φ = 520505580.

The previous prime is 520505569. The next prime is 520505651. The reversal of 520505581 is 185505025.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 519384100 + 1121481 = 22790^2 + 1059^2 .

It is a cyclic number.

It is not a de Polignac number, because 520505581 - 2¹⁷ = 520374509 is a prime.

It is a super-2 number, since 2×520505581² = 541852119704295122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (520505981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260252790 + 260252791.

It is an arithmetic number, because the mean of its divisors is an integer number (260252791).

Almost surely, 2^520505581 is an apocalyptic number.

It is an amenable number.

520505581 is a deficient number, since it is larger than the sum of its proper divisors (1).

520505581 is an equidigital number, since it uses as much as digits as its factorization.

520505581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10000, while the sum is 31.

The square root of 520505581 is about 22814.5914055019. The cubic root of 520505581 is about 804.4056830119.

The spelling of 520505581 in words is "five hundred twenty million, five hundred five thousand, five hundred eighty-one".