9171989 has 2 divisors, whose sum is σ = 9171990. Its totient is φ = 9171988.

The previous prime is 9171983. The next prime is 9171991. The reversal of 9171989 is 9891719.

9171989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8236900 + 935089 = 2870^2 + 967^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9171989 is a prime.

It is a super-2 number, since 2×9171989² = 168250764432242, which contains 22 as substring.

Together with 9171991, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9171983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4585994 + 4585995.

It is an arithmetic number, because the mean of its divisors is an integer number (4585995).

Almost surely, 2^9171989 is an apocalyptic number.

It is an amenable number.

9171989 is a deficient number, since it is larger than the sum of its proper divisors (1).

9171989 is an equidigital number, since it uses as much as digits as its factorization.

9171989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40824, while the sum is 44.

The square root of 9171989 is about 3028.5291809722. The cubic root of 9171989 is about 209.3250362401.

The spelling of 9171989 in words is "nine million, one hundred seventy-one thousand, nine hundred eighty-nine".