9117971 has 2 divisors, whose sum is σ = 9117972. Its totient is φ = 9117970.

The previous prime is 9117931. The next prime is 9117973. The reversal of 9117971 is 1797119.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9117971 is a prime.

Together with 9117973, 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 (9117973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4558985 + 4558986.

It is an arithmetic number, because the mean of its divisors is an integer number (4558986).

Almost surely, 2^9117971 is an apocalyptic number.

9117971 is a deficient number, since it is larger than the sum of its proper divisors (1).

9117971 is an equidigital number, since it uses as much as digits as its factorization.

9117971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3969, while the sum is 35.

The square root of 9117971 is about 3019.5978209026. The cubic root of 9117971 is about 208.9132901910.

It can be divided in two parts, 91 and 17971, that multiplied together give a palindrome (1635361).

The spelling of 9117971 in words is "nine million, one hundred seventeen thousand, nine hundred seventy-one".