9666791 has 4 divisors (see below), whose sum is σ = 9717072. Its totient is φ = 9616512.

The previous prime is 9666781. The next prime is 9666799. The reversal of 9666791 is 1976669.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1976669 = 29 ⋅68161.

It is a cyclic number.

It is not a de Polignac number, because 9666791 - 2¹⁰ = 9665767 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9666799) 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 in 3 ways as a sum of consecutive naturals, for example, 24851 + ... + 25236.

It is an arithmetic number, because the mean of its divisors is an integer number (2429268).

Almost surely, 2^9666791 is an apocalyptic number.

9666791 is a deficient number, since it is larger than the sum of its proper divisors (50281).

9666791 is a wasteful number, since it uses less digits than its factorization.

9666791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50280.

The product of its digits is 122472, while the sum is 44.

The square root of 9666791 is about 3109.1463458641. The cubic root of 9666791 is about 213.0234642463.

The spelling of 9666791 in words is "nine million, six hundred sixty-six thousand, seven hundred ninety-one".