172008009 has 8 divisors (see below), whose sum is σ = 254826720. Its totient is φ = 114671988.

The previous prime is 172007977. The next prime is 172008047. The reversal of 172008009 is 900800271.

It is not a de Polignac number, because 172008009 - 2⁵ = 172007977 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 6370667 = 172008009 / (1 + 7 + 2 + 0 + 0 + 8 + 0 + 0 + 9).

It is not an unprimeable number, because it can be changed into a prime (172008059) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3185307 + ... + 3185360.

It is an arithmetic number, because the mean of its divisors is an integer number (31853340).

Almost surely, 2^172008009 is an apocalyptic number.

It is an amenable number.

172008009 is a deficient number, since it is larger than the sum of its proper divisors (82818711).

172008009 is an equidigital number, since it uses as much as digits as its factorization.

172008009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6370676 (or 6370670 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 172008009 is about 13115.1823853121. The cubic root of 172008009 is about 556.1384083852.

The spelling of 172008009 in words is "one hundred seventy-two million, eight thousand, nine".