170591 has 4 divisors (see below), whose sum is σ = 178032. Its totient is φ = 163152.

The previous prime is 170579. The next prime is 170603. The reversal of 170591 is 195071.

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

It is an interprime number because it is at equal distance from previous prime (170579) and next prime (170603).

It is a cyclic number.

It is not a de Polignac number, because 170591 - 2¹⁰ = 169567 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 7417 = 170591 / (1 + 7 + 0 + 5 + 9 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (170551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3686 + ... + 3731.

It is an arithmetic number, because the mean of its divisors is an integer number (44508).

2¹⁷⁰⁵⁹¹ is an apocalyptic number.

170591 is a deficient number, since it is larger than the sum of its proper divisors (7441).

170591 is an equidigital number, since it uses as much as digits as its factorization.

170591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7440.

The product of its (nonzero) digits is 315, while the sum is 23.

The square root of 170591 is about 413.0266335238. The cubic root of 170591 is about 55.4607031837.

The spelling of 170591 in words is "one hundred seventy thousand, five hundred ninety-one".