6978649 has 2 divisors, whose sum is σ = 6978650. Its totient is φ = 6978648.

The previous prime is 6978641. The next prime is 6978659. The reversal of 6978649 is 9468796.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6579225 + 399424 = 2565^2 + 632^2 .

It is a cyclic number.

It is not a de Polignac number, because 6978649 - 2³ = 6978641 is a prime.

It is a d-powerful number, because it can be written as 6⁷ + 9 + 7⁷ + 8³ + 6⁸ + 4¹¹ + 9³ .

It is not a weakly prime, because it can be changed into another prime (6978641) 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, 3489324 + 3489325.

It is an arithmetic number, because the mean of its divisors is an integer number (3489325).

Almost surely, 2^6978649 is an apocalyptic number.

It is an amenable number.

6978649 is a deficient number, since it is larger than the sum of its proper divisors (1).

6978649 is an equidigital number, since it uses as much as digits as its factorization.

6978649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 653184, while the sum is 49.

The square root of 6978649 is about 2641.7132698308. The cubic root of 6978649 is about 191.0984297542.

The spelling of 6978649 in words is "six million, nine hundred seventy-eight thousand, six hundred forty-nine".