6520005 has 12 divisors (see below), whose sum is σ = 11301420. Its totient is φ = 3477312.

The previous prime is 6519991. The next prime is 6520057. The reversal of 6520005 is 5000256.

It can be written as a sum of positive squares in 2 ways, for example, as 3481956 + 3038049 = 1866^2 + 1743^2 .

It is not a de Polignac number, because 6520005 - 2⁵ = 6519973 is a prime.

6520005 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 6520005.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 72400 + ... + 72489.

It is an arithmetic number, because the mean of its divisors is an integer number (941785).

Almost surely, 2^6520005 is an apocalyptic number.

It is an amenable number.

6520005 is a deficient number, since it is larger than the sum of its proper divisors (4781415).

6520005 is a wasteful number, since it uses less digits than its factorization.

6520005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144900 (or 144897 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 6520005 is about 2553.4300460361. The cubic root of 6520005 is about 186.8168204403.

The spelling of 6520005 in words is "six million, five hundred twenty thousand, five".