170642171 has 4 divisors (see below), whose sum is σ = 195019632. Its totient is φ = 146264712.

The previous prime is 170642161. The next prime is 170642179. The reversal of 170642171 is 171246071.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-170642171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (170642179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12188720 + ... + 12188733.

It is an arithmetic number, because the mean of its divisors is an integer number (48754908).

Almost surely, 2^170642171 is an apocalyptic number.

170642171 is a deficient number, since it is larger than the sum of its proper divisors (24377461).

170642171 is an equidigital number, since it uses as much as digits as its factorization.

170642171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24377460.

The product of its (nonzero) digits is 2352, while the sum is 29.

The square root of 170642171 is about 13063.0077317592. The cubic root of 170642171 is about 554.6624801691.

The spelling of 170642171 in words is "one hundred seventy million, six hundred forty-two thousand, one hundred seventy-one".