520547475991 has 2 divisors, whose sum is σ = 520547475992. Its totient is φ = 520547475990.

The previous prime is 520547475989. The next prime is 520547475997. The reversal of 520547475991 is 199574745025.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 520547475991 - 2¹ = 520547475989 is a prime.

Together with 520547475989, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (520547475997) 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, 260273737995 + 260273737996.

It is an arithmetic number, because the mean of its divisors is an integer number (260273737996).

Almost surely, 2^520547475991 is an apocalyptic number.

520547475991 is a deficient number, since it is larger than the sum of its proper divisors (1).

520547475991 is an equidigital number, since it uses as much as digits as its factorization.

520547475991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15876000, while the sum is 58.

The spelling of 520547475991 in words is "five hundred twenty billion, five hundred forty-seven million, four hundred seventy-five thousand, nine hundred ninety-one".