172009089 has 20 divisors (see below), whose sum is σ = 293660224. Its totient is φ = 98290584.

The previous prime is 172009087. The next prime is 172009129. The reversal of 172009089 is 980900271.

It is a happy number.

It is not a de Polignac number, because 172009089 - 2¹ = 172009087 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172009087) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 151117 + ... + 152250.

Almost surely, 2^172009089 is an apocalyptic number.

It is an amenable number.

172009089 is a deficient number, since it is larger than the sum of its proper divisors (121651135).

172009089 is an equidigital number, since it uses as much as digits as its factorization.

172009089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303386 (or 303377 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 172009089 is about 13115.2235589028. The cubic root of 172009089 is about 556.1395723392.

The spelling of 172009089 in words is "one hundred seventy-two million, nine thousand, eighty-nine".