9928661 has 2 divisors, whose sum is σ = 9928662. Its totient is φ = 9928660.

The previous prime is 9928619. The next prime is 9928669. The reversal of 9928661 is 1668299.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9891025 + 37636 = 3145^2 + 194^2 .

It is an emirp because it is prime and its reverse (1668299) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9928661 - 2¹⁰ = 9927637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9928669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4964330 + 4964331.

It is an arithmetic number, because the mean of its divisors is an integer number (4964331).

Almost surely, 2^9928661 is an apocalyptic number.

It is an amenable number.

9928661 is a deficient number, since it is larger than the sum of its proper divisors (1).

9928661 is an equidigital number, since it uses as much as digits as its factorization.

9928661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46656, while the sum is 41.

The square root of 9928661 is about 3150.9777847519. The cubic root of 9928661 is about 214.9299284902.

The spelling of 9928661 in words is "nine million, nine hundred twenty-eight thousand, six hundred sixty-one".