6978659 has 2 divisors, whose sum is σ = 6978660. Its totient is φ = 6978658.

The previous prime is 6978649. The next prime is 6978677. The reversal of 6978659 is 9568796.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6978659 - 2¹² = 6974563 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (6978649) 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, 3489329 + 3489330.

It is an arithmetic number, because the mean of its divisors is an integer number (3489330).

Almost surely, 2^6978659 is an apocalyptic number.

6978659 is a deficient number, since it is larger than the sum of its proper divisors (1).

6978659 is an equidigital number, since it uses as much as digits as its factorization.

6978659 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 816480, while the sum is 50.

The square root of 6978659 is about 2641.7151625412. The cubic root of 6978659 is about 191.0985210318.

The spelling of 6978659 in words is "six million, nine hundred seventy-eight thousand, six hundred fifty-nine".