171688609 has 3 divisors (see below), whose sum is σ = 171701713. Its totient is φ = 171675506.

The previous prime is 171688597. The next prime is 171688619. The reversal of 171688609 is 906886171.

The square root of 171688609 is 13103.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 906886171 = 101 ⋅8979071.

It is not a de Polignac number, because 171688609 - 2¹¹ = 171686561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (171688619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 6552 + ... + 19654.

Almost surely, 2^171688609 is an apocalyptic number.

171688609 is the 13103-rd square number.

171688609 is the 6552-nd centered octagonal number.

It is an amenable number.

171688609 is a deficient number, since it is larger than the sum of its proper divisors (13104).

171688609 is an frugal number, since it uses more digits than its factorization.

171688609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26206 (or 13103 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 46.

The cubic root of 171688609 is about 555.7939657648.

The spelling of 171688609 in words is "one hundred seventy-one million, six hundred eighty-eight thousand, six hundred nine".