9172989 has 12 divisors (see below), whose sum is σ = 15142816. Its totient is φ = 5241672.

The previous prime is 9172981. The next prime is 9173011. The reversal of 9172989 is 9892719.

It is not a de Polignac number, because 9172989 - 2³ = 9172981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9172981) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 72739 + ... + 72864.

Almost surely, 2^9172989 is an apocalyptic number.

It is an amenable number.

9172989 is a deficient number, since it is larger than the sum of its proper divisors (5969827).

9172989 is a wasteful number, since it uses less digits than its factorization.

9172989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145616 (or 145613 counting only the distinct ones).

The product of its digits is 81648, while the sum is 45.

The square root of 9172989 is about 3028.6942731151. The cubic root of 9172989 is about 209.3326433662.

The spelling of 9172989 in words is "nine million, one hundred seventy-two thousand, nine hundred eighty-nine".