9649 has 2 divisors, whose sum is σ = 9650. Its totient is φ = 9648.

The previous prime is 9643. The next prime is 9661. The reversal of 9649 is 9469.

9649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6400 + 3249 = 80^2 + 57^2 .

It is a cyclic number.

It is not a de Polignac number, because 9649 - 2⁷ = 9521 is a prime.

It is a Chen prime.

9649 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (9643) 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, 4824 + 4825.

It is an arithmetic number, because the mean of its divisors is an integer number (4825).

2⁹⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

9649 is a deficient number, since it is larger than the sum of its proper divisors (1).

9649 is an equidigital number, since it uses as much as digits as its factorization.

9649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1944, while the sum is 28.

The square root of 9649 is about 98.2293235241. The cubic root of 9649 is about 21.2892699451.

The spelling of 9649 in words is "nine thousand, six hundred forty-nine".