9685661 has 2 divisors, whose sum is σ = 9685662. Its totient is φ = 9685660.

The previous prime is 9685651. The next prime is 9685667. The reversal of 9685661 is 1665869.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9302500 + 383161 = 3050^2 + 619^2 .

It is an emirp because it is prime and its reverse (1665869) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9685661 - 2¹⁸ = 9423517 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9685667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4842830 + 4842831.

It is an arithmetic number, because the mean of its divisors is an integer number (4842831).

Almost surely, 2^9685661 is an apocalyptic number.

It is an amenable number.

9685661 is a deficient number, since it is larger than the sum of its proper divisors (1).

9685661 is an equidigital number, since it uses as much as digits as its factorization.

9685661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77760, while the sum is 41.

The square root of 9685661 is about 3112.1794614064. The cubic root of 9685661 is about 213.1619845345.

The spelling of 9685661 in words is "nine million, six hundred eighty-five thousand, six hundred sixty-one".