6520511971 has 2 divisors, whose sum is σ = 6520511972. Its totient is φ = 6520511970.

The previous prime is 6520511929. The next prime is 6520512001. The reversal of 6520511971 is 1791150256.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6520511971 - 2⁷ = 6520511843 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6520511971.

It is not a weakly prime, because it can be changed into another prime (6520511071) 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, 3260255985 + 3260255986.

It is an arithmetic number, because the mean of its divisors is an integer number (3260255986).

Almost surely, 2^6520511971 is an apocalyptic number.

6520511971 is a deficient number, since it is larger than the sum of its proper divisors (1).

6520511971 is an equidigital number, since it uses as much as digits as its factorization.

6520511971 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18900, while the sum is 37.

The square root of 6520511971 is about 80749.6871263289. The cubic root of 6520511971 is about 1868.2166237195.

The spelling of 6520511971 in words is "six billion, five hundred twenty million, five hundred eleven thousand, nine hundred seventy-one".