9686991 has 12 divisors (see below), whose sum is σ = 13721672. Its totient is φ = 6077568.

The previous prime is 9686977. The next prime is 9687001. The reversal of 9686991 is 1996869.

It is not a de Polignac number, because 9686991 - 2¹⁸ = 9424847 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9686991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9686921) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4720 + ... + 6453.

Almost surely, 2^9686991 is an apocalyptic number.

9686991 is a deficient number, since it is larger than the sum of its proper divisors (4034681).

9686991 is a wasteful number, since it uses less digits than its factorization.

9686991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11210 (or 11193 counting only the distinct ones).

The product of its digits is 209952, while the sum is 48.

The square root of 9686991 is about 3112.3931306954. The cubic root of 9686991 is about 213.1717409660.

The spelling of 9686991 in words is "nine million, six hundred eighty-six thousand, nine hundred ninety-one".