520138571 has 2 divisors, whose sum is σ = 520138572. Its totient is φ = 520138570.

The previous prime is 520138501. The next prime is 520138573. The reversal of 520138571 is 175831025.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 520138571 - 2²² = 515944267 is a prime.

Together with 520138573, 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 (520138573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260069285 + 260069286.

It is an arithmetic number, because the mean of its divisors is an integer number (260069286).

Almost surely, 2^520138571 is an apocalyptic number.

520138571 is a deficient number, since it is larger than the sum of its proper divisors (1).

520138571 is an equidigital number, since it uses as much as digits as its factorization.

520138571 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8400, while the sum is 32.

The square root of 520138571 is about 22806.5466697613. The cubic root of 520138571 is about 804.2165756288.

Adding to 520138571 its reverse (175831025), we get a palindrome (695969596).

The spelling of 520138571 in words is "five hundred twenty million, one hundred thirty-eight thousand, five hundred seventy-one".