173145 has 32 divisors (see below), whose sum is σ = 338688. Its totient is φ = 73728.

The previous prime is 173141. The next prime is 173149. The reversal of 173145 is 541371.

It is an interprime number because it is at equal distance from previous prime (173141) and next prime (173149).

It is not a de Polignac number, because 173145 - 2² = 173141 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (173141) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1737 + ... + 1833.

It is an arithmetic number, because the mean of its divisors is an integer number (10584).

2¹⁷³¹⁴⁵ is an apocalyptic number.

173145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

173145 is a deficient number, since it is larger than the sum of its proper divisors (165543).

173145 is a wasteful number, since it uses less digits than its factorization.

173145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129.

The product of its digits is 420, while the sum is 21.

The square root of 173145 is about 416.1069574040. The cubic root of 173145 is about 55.7361096056.

Adding to 173145 its sum of digits (21), we get a triangular number (173166 = T₅₈₈).

The spelling of 173145 in words is "one hundred seventy-three thousand, one hundred forty-five".