9967649 has 2 divisors, whose sum is σ = 9967650. Its totient is φ = 9967648.

The previous prime is 9967631. The next prime is 9967669. The reversal of 9967649 is 9467699.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9412624 + 555025 = 3068^2 + 745^2 .

It is an emirp because it is prime and its reverse (9467699) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9967649 - 2¹² = 9963553 is a prime.

It is a Sophie Germain prime.

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 = 9967597 and 9967606.

It is not a weakly prime, because it can be changed into another prime (9967669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4983824 + 4983825.

It is an arithmetic number, because the mean of its divisors is an integer number (4983825).

Almost surely, 2^9967649 is an apocalyptic number.

It is an amenable number.

9967649 is a deficient number, since it is larger than the sum of its proper divisors (1).

9967649 is an equidigital number, since it uses as much as digits as its factorization.

9967649 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 9967649 is about 3157.1583742347. The cubic root of 9967649 is about 215.2108909627.

Adding to 9967649 its sum of digits (50), we get a palindrome (9967699).

The spelling of 9967649 in words is "nine million, nine hundred sixty-seven thousand, six hundred forty-nine".