9687661 has 2 divisors, whose sum is σ = 9687662. Its totient is φ = 9687660.

The previous prime is 9687647. The next prime is 9687697. The reversal of 9687661 is 1667869.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8820900 + 866761 = 2970^2 + 931^2 .

It is a cyclic number.

It is not a de Polignac number, because 9687661 - 2¹³ = 9679469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9687641) 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, 4843830 + 4843831.

It is an arithmetic number, because the mean of its divisors is an integer number (4843831).

Almost surely, 2^9687661 is an apocalyptic number.

It is an amenable number.

9687661 is a deficient number, since it is larger than the sum of its proper divisors (1).

9687661 is an equidigital number, since it uses as much as digits as its factorization.

9687661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 43.

The square root of 9687661 is about 3112.5007630521. The cubic root of 9687661 is about 213.1766555218.

The spelling of 9687661 in words is "nine million, six hundred eighty-seven thousand, six hundred sixty-one".