170139 has 4 divisors (see below), whose sum is σ = 226856. Its totient is φ = 113424.

The previous prime is 170123. The next prime is 170141. The reversal of 170139 is 931071.

170139 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 931071 = 3 ⋅310357.

It is not a de Polignac number, because 170139 - 2⁴ = 170123 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (170179) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28354 + ... + 28359.

It is an arithmetic number, because the mean of its divisors is an integer number (56714).

2¹⁷⁰¹³⁹ is an apocalyptic number.

170139 is a deficient number, since it is larger than the sum of its proper divisors (56717).

170139 is an equidigital number, since it uses as much as digits as its factorization.

170139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56716.

The product of its (nonzero) digits is 189, while the sum is 21.

The square root of 170139 is about 412.4790903791. The cubic root of 170139 is about 55.4116767387.

The spelling of 170139 in words is "one hundred seventy thousand, one hundred thirty-nine".