173139 has 4 divisors (see below), whose sum is σ = 230856. Its totient is φ = 115424.

The previous prime is 173137. The next prime is 173141. The reversal of 173139 is 931371.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (173137) and next prime (173141).

It is a cyclic number.

It is not a de Polignac number, because 173139 - 2¹ = 173137 is a prime.

It is a super-2 number, since 2×173139² = 59954226642, which contains 22 as substring.

It is a D-number.

173139 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (173137) 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, 28854 + ... + 28859.

It is an arithmetic number, because the mean of its divisors is an integer number (57714).

2¹⁷³¹³⁹ is an apocalyptic number.

173139 is a deficient number, since it is larger than the sum of its proper divisors (57717).

173139 is an equidigital number, since it uses as much as digits as its factorization.

173139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57716.

The product of its digits is 567, while the sum is 24.

The square root of 173139 is about 416.0997476567. The cubic root of 173139 is about 55.7354657897.

It can be divided in two parts, 1731 and 39, that added together give a triangular number (1770 = T₅₉).

The spelling of 173139 in words is "one hundred seventy-three thousand, one hundred thirty-nine".