6511986 has 48 divisors (see below), whose sum is σ = 16098264. Its totient is φ = 1884672.

The previous prime is 6511961. The next prime is 6511997. The reversal of 6511986 is 6891156.

It can be written as a sum of positive squares in 4 ways, for example, as 3515625 + 2996361 = 1875^2 + 1731^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 6511986.

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 23 ways as a sum of consecutive naturals, for example, 3160 + ... + 4796.

Almost surely, 2^6511986 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6511986, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8049132).

6511986 is an abundant number, since it is smaller than the sum of its proper divisors (9586278).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6511986 is a wasteful number, since it uses less digits than its factorization.

6511986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1675 (or 1672 counting only the distinct ones).

The product of its digits is 12960, while the sum is 36.

The square root of 6511986 is about 2551.8593221414. The cubic root of 6511986 is about 186.7401999126.

The spelling of 6511986 in words is "six million, five hundred eleven thousand, nine hundred eighty-six".