9681791 has 4 divisors (see below), whose sum is σ = 11064912. Its totient is φ = 8298672.

The previous prime is 9681769. The next prime is 9681797. The reversal of 9681791 is 1971869.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 9681791 - 2¹⁴ = 9665407 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 (9681797) 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 in 3 ways as a sum of consecutive naturals, for example, 691550 + ... + 691563.

It is an arithmetic number, because the mean of its divisors is an integer number (2766228).

Almost surely, 2^9681791 is an apocalyptic number.

9681791 is a deficient number, since it is larger than the sum of its proper divisors (1383121).

9681791 is a wasteful number, since it uses less digits than its factorization.

9681791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1383120.

The product of its digits is 27216, while the sum is 41.

The square root of 9681791 is about 3111.5576485098. The cubic root of 9681791 is about 213.1335904381.

The spelling of 9681791 in words is "nine million, six hundred eighty-one thousand, seven hundred ninety-one".