171604 has 6 divisors (see below), whose sum is σ = 300314. Its totient is φ = 85800.

The previous prime is 171583. The next prime is 171617. The reversal of 171604 is 406171.

It is a happy number.

171604 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 161604 + 10000 = 402^2 + 100^2 .

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21447 + ... + 21454.

2¹⁷¹⁶⁰⁴ is an apocalyptic number.

It is an amenable number.

171604 is a deficient number, since it is larger than the sum of its proper divisors (128710).

171604 is a wasteful number, since it uses less digits than its factorization.

171604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42905 (or 42903 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 171604 is about 414.2511315615. The cubic root of 171604 is about 55.5702651420.

Adding to 171604 its reverse (406171), we get a palindrome (577775).

The spelling of 171604 in words is "one hundred seventy-one thousand, six hundred four".