9664891 has 4 divisors (see below), whose sum is σ = 10233432. Its totient is φ = 9096352.

The previous prime is 9664883. The next prime is 9664903. The reversal of 9664891 is 1984669.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1984669 = 47 ⋅42227.

It is a cyclic number.

It is not a de Polignac number, because 9664891 - 2³ = 9664883 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 (9664841) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 284245 + ... + 284278.

It is an arithmetic number, because the mean of its divisors is an integer number (2558358).

Almost surely, 2^9664891 is an apocalyptic number.

9664891 is a deficient number, since it is larger than the sum of its proper divisors (568541).

9664891 is a wasteful number, since it uses less digits than its factorization.

9664891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 568540.

The product of its digits is 93312, while the sum is 43.

The square root of 9664891 is about 3108.8407807413. The cubic root of 9664891 is about 213.0095068016.

The spelling of 9664891 in words is "nine million, six hundred sixty-four thousand, eight hundred ninety-one".