309139173 has 40 divisors (see below), whose sum is σ = 536775360. Its totient is φ = 173638080.

The previous prime is 309139141. The next prime is 309139189. The reversal of 309139173 is 371931903.

It is not a de Polignac number, because 309139173 - 2⁵ = 309139141 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (309139073) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 28833 + ... + 38073.

It is an arithmetic number, because the mean of its divisors is an integer number (13419384).

Almost surely, 2^309139173 is an apocalyptic number.

It is an amenable number.

309139173 is a deficient number, since it is larger than the sum of its proper divisors (227636187).

309139173 is an equidigital number, since it uses as much as digits as its factorization.

309139173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9319 (or 9310 counting only the distinct ones).

The product of its (nonzero) digits is 15309, while the sum is 36.

The square root of 309139173 is about 17582.3540232814. The cubic root of 309139173 is about 676.1629138588.

The spelling of 309139173 in words is "three hundred nine million, one hundred thirty-nine thousand, one hundred seventy-three".