520543139 has 2 divisors, whose sum is σ = 520543140. Its totient is φ = 520543138.

The previous prime is 520543129. The next prime is 520543141. The reversal of 520543139 is 931345025.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 520543139 - 2²⁴ = 503765923 is a prime.

Together with 520543141, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (520543129) 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, 260271569 + 260271570.

It is an arithmetic number, because the mean of its divisors is an integer number (260271570).

Almost surely, 2^520543139 is an apocalyptic number.

520543139 is a deficient number, since it is larger than the sum of its proper divisors (1).

520543139 is an equidigital number, since it uses as much as digits as its factorization.

520543139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16200, while the sum is 32.

The square root of 520543139 is about 22815.4145042338. The cubic root of 520543139 is about 804.4250303177.

The spelling of 520543139 in words is "five hundred twenty million, five hundred forty-three thousand, one hundred thirty-nine".