9639997 has 2 divisors, whose sum is σ = 9639998. Its totient is φ = 9639996.

The previous prime is 9639979. The next prime is 9640021. The reversal of 9639997 is 7999369.

Together with previous prime (9639979) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5225796 + 4414201 = 2286^2 + 2101^2 .

It is a cyclic number.

It is not a de Polignac number, because 9639997 - 2¹¹ = 9637949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9639907) 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, 4819998 + 4819999.

It is an arithmetic number, because the mean of its divisors is an integer number (4819999).

Almost surely, 2^9639997 is an apocalyptic number.

It is an amenable number.

9639997 is a deficient number, since it is larger than the sum of its proper divisors (1).

9639997 is an equidigital number, since it uses as much as digits as its factorization.

9639997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 826686, while the sum is 52.

The square root of 9639997 is about 3104.8344561345. The cubic root of 9639997 is about 212.8264656651.

The spelling of 9639997 in words is "nine million, six hundred thirty-nine thousand, nine hundred ninety-seven".