9897971 has 2 divisors, whose sum is σ = 9897972. Its totient is φ = 9897970.

The previous prime is 9897941. The next prime is 9897973. The reversal of 9897971 is 1797989.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9897971 is a prime.

Together with 9897973, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (9897973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4948985 + 4948986.

It is an arithmetic number, because the mean of its divisors is an integer number (4948986).

Almost surely, 2^9897971 is an apocalyptic number.

9897971 is a deficient number, since it is larger than the sum of its proper divisors (1).

9897971 is an equidigital number, since it uses as much as digits as its factorization.

9897971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 285768, while the sum is 50.

The square root of 9897971 is about 3146.1040987227. The cubic root of 9897971 is about 214.7082467818.

The spelling of 9897971 in words is "nine million, eight hundred ninety-seven thousand, nine hundred seventy-one".