170491 has 4 divisors (see below), whose sum is σ = 176400. Its totient is φ = 164584.

The previous prime is 170483. The next prime is 170497. The reversal of 170491 is 194071.

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

It is a cyclic number.

It is not a de Polignac number, because 170491 - 2³ = 170483 is a prime.

It is a Duffinian number.

170491 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (170497) 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, 2911 + ... + 2968.

It is an arithmetic number, because the mean of its divisors is an integer number (44100).

2¹⁷⁰⁴⁹¹ is an apocalyptic number.

170491 is a deficient number, since it is larger than the sum of its proper divisors (5909).

170491 is an equidigital number, since it uses as much as digits as its factorization.

170491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5908.

The product of its (nonzero) digits is 252, while the sum is 22.

The square root of 170491 is about 412.9055582091. The cubic root of 170491 is about 55.4498640922.

The spelling of 170491 in words is "one hundred seventy thousand, four hundred ninety-one".