520065409 has 2 divisors, whose sum is σ = 520065410. Its totient is φ = 520065408.

The previous prime is 520065401. The next prime is 520065419. The reversal of 520065409 is 904560025.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 297459009 + 222606400 = 17247^2 + 14920^2 .

It is a cyclic number.

It is not a de Polignac number, because 520065409 - 2³ = 520065401 is a prime.

It is not a weakly prime, because it can be changed into another prime (520065401) 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 as a sum of consecutive naturals, namely, 260032704 + 260032705.

It is an arithmetic number, because the mean of its divisors is an integer number (260032705).

Almost surely, 2^520065409 is an apocalyptic number.

It is an amenable number.

520065409 is a deficient number, since it is larger than the sum of its proper divisors (1).

520065409 is an equidigital number, since it uses as much as digits as its factorization.

520065409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 520065409 is about 22804.9426440849. The cubic root of 520065409 is about 804.1788671826.

The spelling of 520065409 in words is "five hundred twenty million, sixty-five thousand, four hundred nine".