6864661 has 2 divisors, whose sum is σ = 6864662. Its totient is φ = 6864660.

The previous prime is 6864653. The next prime is 6864691. The reversal of 6864661 is 1664686.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6400900 + 463761 = 2530^2 + 681^2 .

It is a cyclic number.

It is not a de Polignac number, because 6864661 - 2³ = 6864653 is a prime.

6864661 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 6864661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6864601) 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 as a sum of consecutive naturals, namely, 3432330 + 3432331.

It is an arithmetic number, because the mean of its divisors is an integer number (3432331).

Almost surely, 2^6864661 is an apocalyptic number.

It is an amenable number.

6864661 is a deficient number, since it is larger than the sum of its proper divisors (1).

6864661 is an equidigital number, since it uses as much as digits as its factorization.

6864661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41472, while the sum is 37.

The square root of 6864661 is about 2620.0498086869. The cubic root of 6864661 is about 190.0522570942.

The spelling of 6864661 in words is "six million, eight hundred sixty-four thousand, six hundred sixty-one".