171445 has 8 divisors (see below), whose sum is σ = 217944. Its totient is φ = 129024.

The previous prime is 171439. The next prime is 171449. The reversal of 171445 is 544171.

It can be written as a sum of positive squares in 4 ways, for example, as 64516 + 106929 = 254^2 + 327^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a 6-Lehmer number, since φ(171445) divides (171445-1)⁶.

It is a cyclic number.

It is not a de Polignac number, because 171445 - 2⁷ = 171317 is a prime.

It is a Duffinian number.

171445 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (171449) 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 7 ways as a sum of consecutive naturals, for example, 924 + ... + 1093.

It is an arithmetic number, because the mean of its divisors is an integer number (27243).

2¹⁷¹⁴⁴⁵ is an apocalyptic number.

It is an amenable number.

171445 is a deficient number, since it is larger than the sum of its proper divisors (46499).

171445 is a wasteful number, since it uses less digits than its factorization.

171445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2039.

The product of its digits is 560, while the sum is 22.

The square root of 171445 is about 414.0591745149. The cubic root of 171445 is about 55.5530969282.

It can be divided in two parts, 171 and 445, that added together give a palindrome (616).

The spelling of 171445 in words is "one hundred seventy-one thousand, four hundred forty-five".