172329609 has 16 divisors (see below), whose sum is σ = 238289792. Its totient is φ = 110688768.

The previous prime is 172329587. The next prime is 172329613. The reversal of 172329609 is 906923271.

It is not a de Polignac number, because 172329609 - 2⁷ = 172329481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172329649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3897 + ... + 18969.

It is an arithmetic number, because the mean of its divisors is an integer number (14893112).

Almost surely, 2^172329609 is an apocalyptic number.

It is an amenable number.

172329609 is a deficient number, since it is larger than the sum of its proper divisors (65960183).

172329609 is a wasteful number, since it uses less digits than its factorization.

172329609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15216.

The product of its (nonzero) digits is 40824, while the sum is 39.

The square root of 172329609 is about 13127.4372594197. The cubic root of 172329609 is about 556.4847929559.

The spelling of 172329609 in words is "one hundred seventy-two million, three hundred twenty-nine thousand, six hundred nine".