520518521 has 2 divisors, whose sum is σ = 520518522. Its totient is φ = 520518520.

The previous prime is 520518503. The next prime is 520518539. The reversal of 520518521 is 125815025.

It is a balanced prime because it is at equal distance from previous prime (520518503) and next prime (520518539).

It can be written as a sum of positive squares in only one way, i.e., 518928400 + 1590121 = 22780^2 + 1261^2 .

It is a cyclic number.

It is not a de Polignac number, because 520518521 - 2¹⁴ = 520502137 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (520518541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260259260 + 260259261.

It is an arithmetic number, because the mean of its divisors is an integer number (260259261).

Almost surely, 2^520518521 is an apocalyptic number.

It is an amenable number.

520518521 is a deficient number, since it is larger than the sum of its proper divisors (1).

520518521 is an equidigital number, since it uses as much as digits as its factorization.

520518521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4000, while the sum is 29.

The square root of 520518521 is about 22814.8749941787. The cubic root of 520518521 is about 804.4123489175.

The spelling of 520518521 in words is "five hundred twenty million, five hundred eighteen thousand, five hundred twenty-one".