9639649 has 2 divisors, whose sum is σ = 9639650. Its totient is φ = 9639648.

The previous prime is 9639601. The next prime is 9639661. The reversal of 9639649 is 9469369.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6594624 + 3045025 = 2568^2 + 1745^2 .

It is a cyclic number.

It is not a de Polignac number, because 9639649 - 2⁷ = 9639521 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 9639599 and 9639608.

It is not a weakly prime, because it can be changed into another prime (9639349) 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, 4819824 + 4819825.

It is an arithmetic number, because the mean of its divisors is an integer number (4819825).

Almost surely, 2^9639649 is an apocalyptic number.

It is an amenable number.

9639649 is a deficient number, since it is larger than the sum of its proper divisors (1).

9639649 is an equidigital number, since it uses as much as digits as its factorization.

9639649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 314928, while the sum is 46.

The square root of 9639649 is about 3104.7784139935. The cubic root of 9639649 is about 212.8239046511.

Subtracting from 9639649 its product of digits (314928), we obtain a triangular number (9324721 = T₄₃₁₈).

The spelling of 9639649 in words is "nine million, six hundred thirty-nine thousand, six hundred forty-nine".