171609 has 4 divisors (see below), whose sum is σ = 228816. Its totient is φ = 114404.

The previous prime is 171583. The next prime is 171617. The reversal of 171609 is 906171.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 171609 - 2⁷ = 171481 is a prime.

It is a D-number.

It is a Curzon number.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (171629) 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, 28599 + ... + 28604.

It is an arithmetic number, because the mean of its divisors is an integer number (57204).

2¹⁷¹⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

171609 is a deficient number, since it is larger than the sum of its proper divisors (57207).

171609 is an equidigital number, since it uses as much as digits as its factorization.

171609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57206.

The product of its (nonzero) digits is 378, while the sum is 24.

The square root of 171609 is about 414.2571665041. The cubic root of 171609 is about 55.5708048509.

It can be divided in two parts, 171 and 609, that added together give a triangular number (780 = T₃₉).

The spelling of 171609 in words is "one hundred seventy-one thousand, six hundred nine".