9681997 has 6 divisors (see below), whose sum is σ = 10438862. Its totient is φ = 8926872.

The previous prime is 9681989. The next prime is 9682007. The reversal of 9681997 is 7991869.

9681997 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 6702921 + 2979076 = 2589^2 + 1726^2 .

It is not a de Polignac number, because 9681997 - 2³ = 9681989 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 9681997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9681907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10788 + ... + 11650.

Almost surely, 2^9681997 is an apocalyptic number.

It is an amenable number.

9681997 is a deficient number, since it is larger than the sum of its proper divisors (756865).

9681997 is an frugal number, since it uses more digits than its factorization.

9681997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1739 (or 876 counting only the distinct ones).

The product of its digits is 244944, while the sum is 49.

The square root of 9681997 is about 3111.5907507254. The cubic root of 9681997 is about 213.1351020458.

The spelling of 9681997 in words is "nine million, six hundred eighty-one thousand, nine hundred ninety-seven".