171680809 has 8 divisors (see below), whose sum is σ = 180335232. Its totient is φ = 163125600.

The previous prime is 171680771. The next prime is 171680837. The reversal of 171680809 is 908086171.

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

It is a cyclic number.

It is not a de Polignac number, because 171680809 - 2¹⁵ = 171648041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (171680879) 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 7 ways as a sum of consecutive naturals, for example, 21244 + ... + 28189.

It is an arithmetic number, because the mean of its divisors is an integer number (22541904).

Almost surely, 2^171680809 is an apocalyptic number.

It is an amenable number.

171680809 is a deficient number, since it is larger than the sum of its proper divisors (8654423).

171680809 is a wasteful number, since it uses less digits than its factorization.

171680809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49607.

The product of its (nonzero) digits is 24192, while the sum is 40.

The square root of 171680809 is about 13102.7023548579. The cubic root of 171680809 is about 555.7855488628.

The spelling of 171680809 in words is "one hundred seventy-one million, six hundred eighty thousand, eight hundred nine".