9171997 has 2 divisors, whose sum is σ = 9171998. Its totient is φ = 9171996.

The previous prime is 9171991. The next prime is 9172039. The reversal of 9171997 is 7991719.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7338681 + 1833316 = 2709^2 + 1354^2 .

It is a cyclic number.

It is not a de Polignac number, because 9171997 - 2³ = 9171989 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9171991) 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, 4585998 + 4585999.

It is an arithmetic number, because the mean of its divisors is an integer number (4585999).

Almost surely, 2^9171997 is an apocalyptic number.

It is an amenable number.

9171997 is a deficient number, since it is larger than the sum of its proper divisors (1).

9171997 is an equidigital number, since it uses as much as digits as its factorization.

9171997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 35721, while the sum is 43.

The square root of 9171997 is about 3028.5305017450. The cubic root of 9171997 is about 209.3250970993.

The spelling of 9171997 in words is "nine million, one hundred seventy-one thousand, nine hundred ninety-seven".