520545139 has 2 divisors, whose sum is σ = 520545140. Its totient is φ = 520545138.

The previous prime is 520545121. The next prime is 520545161. The reversal of 520545139 is 931545025.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 520545139 - 2¹¹ = 520543091 is a prime.

It is not a weakly prime, because it can be changed into another prime (520543139) 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, 260272569 + 260272570.

It is an arithmetic number, because the mean of its divisors is an integer number (260272570).

Almost surely, 2^520545139 is an apocalyptic number.

520545139 is a deficient number, since it is larger than the sum of its proper divisors (1).

520545139 is an equidigital number, since it uses as much as digits as its factorization.

520545139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27000, while the sum is 34.

The square root of 520545139 is about 22815.4583342084. The cubic root of 520545139 is about 804.4260605545.

The spelling of 520545139 in words is "five hundred twenty million, five hundred forty-five thousand, one hundred thirty-nine".