9997931 has 8 divisors (see below), whose sum is σ = 10194240. Its totient is φ = 9803592.

The previous prime is 9997927. The next prime is 9997937. The reversal of 9997931 is 1397999.

It is a happy number.

9997931 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9997931 - 2² = 9997927 is a prime.

It is a super-2 number, since 2×9997931² = 199917248561522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9997937) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13160 + ... + 13898.

It is an arithmetic number, because the mean of its divisors is an integer number (1274280).

Almost surely, 2^9997931 is an apocalyptic number.

9997931 is a deficient number, since it is larger than the sum of its proper divisors (196309).

9997931 is a wasteful number, since it uses less digits than its factorization.

9997931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 985.

The product of its digits is 137781, while the sum is 47.

The square root of 9997931 is about 3161.9505056215. The cubic root of 9997931 is about 215.4286095604.

The spelling of 9997931 in words is "nine million, nine hundred ninety-seven thousand, nine hundred thirty-one".