9897931 has 2 divisors, whose sum is σ = 9897932. Its totient is φ = 9897930.

The previous prime is 9897929. The next prime is 9897941. The reversal of 9897931 is 1397989.

9897931 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (1397989) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9897931 - 2¹ = 9897929 is a prime.

It is a super-2 number, since 2×9897931² = 195938076161522, which contains 22 as substring.

Together with 9897929, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (9897941) 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 as a sum of consecutive naturals, namely, 4948965 + 4948966.

It is an arithmetic number, because the mean of its divisors is an integer number (4948966).

Almost surely, 2^9897931 is an apocalyptic number.

9897931 is a deficient number, since it is larger than the sum of its proper divisors (1).

9897931 is an equidigital number, since it uses as much as digits as its factorization.

9897931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 122472, while the sum is 46.

The square root of 9897931 is about 3146.0977416476. The cubic root of 9897931 is about 214.7079575528.

The spelling of 9897931 in words is "nine million, eight hundred ninety-seven thousand, nine hundred thirty-one".