520637971 has 24 divisors (see below), whose sum is σ = 639542304. Its totient is φ = 413752320.

The previous prime is 520637969. The next prime is 520638011. The reversal of 520637971 is 179736025.

It is not a de Polignac number, because 520637971 - 2¹ = 520637969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (520637071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 633741 + ... + 634561.

It is an arithmetic number, because the mean of its divisors is an integer number (26647596).

Almost surely, 2^520637971 is an apocalyptic number.

520637971 is a deficient number, since it is larger than the sum of its proper divisors (118904333).

520637971 is an equidigital number, since it uses as much as digits as its factorization.

520637971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 991 (or 918 counting only the distinct ones).

The product of its (nonzero) digits is 79380, while the sum is 40.

The square root of 520637971 is about 22817.4926536638. The cubic root of 520637971 is about 804.4738771194.

The spelling of 520637971 in words is "five hundred twenty million, six hundred thirty-seven thousand, nine hundred seventy-one".