520522391 has 2 divisors, whose sum is σ = 520522392. Its totient is φ = 520522390.

The previous prime is 520522307. The next prime is 520522393. The reversal of 520522391 is 193225025.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 520522391 - 2¹⁰ = 520521367 is a prime.

Together with 520522393, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (520522393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260261195 + 260261196.

It is an arithmetic number, because the mean of its divisors is an integer number (260261196).

Almost surely, 2^520522391 is an apocalyptic number.

520522391 is a deficient number, since it is larger than the sum of its proper divisors (1).

520522391 is an equidigital number, since it uses as much as digits as its factorization.

520522391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 520522391 is about 22814.9598071090. The cubic root of 520522391 is about 804.4143424861.

The spelling of 520522391 in words is "five hundred twenty million, five hundred twenty-two thousand, three hundred ninety-one".