6997649 has 2 divisors, whose sum is σ = 6997650. Its totient is φ = 6997648.

The previous prime is 6997633. The next prime is 6997651. The reversal of 6997649 is 9467996.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6927424 + 70225 = 2632^2 + 265^2 .

It is a cyclic number.

It is not a de Polignac number, because 6997649 - 2⁴ = 6997633 is a prime.

It is a Sophie Germain prime.

Together with 6997651, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 6997597 and 6997606.

It is not a weakly prime, because it can be changed into another prime (6997609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3498824 + 3498825.

It is an arithmetic number, because the mean of its divisors is an integer number (3498825).

Almost surely, 2^6997649 is an apocalyptic number.

It is an amenable number.

6997649 is a deficient number, since it is larger than the sum of its proper divisors (1).

6997649 is an equidigital number, since it uses as much as digits as its factorization.

6997649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 734832, while the sum is 50.

The square root of 6997649 is about 2645.3069765152. The cubic root of 6997649 is about 191.2717001592.

The spelling of 6997649 in words is "six million, nine hundred ninety-seven thousand, six hundred forty-nine".