170257 has 4 divisors (see below), whose sum is σ = 172260. Its totient is φ = 168256.

The previous prime is 170249. The next prime is 170263. The reversal of 170257 is 752071.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 752071 = 131 ⋅5741.

It can be written as a sum of positive squares in 2 ways, for example, as 92416 + 77841 = 304^2 + 279^2 .

It is a cyclic number.

It is not a de Polignac number, because 170257 - 2³ = 170249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (170207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 868 + ... + 1045.

It is an arithmetic number, because the mean of its divisors is an integer number (43065).

2¹⁷⁰²⁵⁷ is an apocalyptic number.

It is an amenable number.

170257 is a deficient number, since it is larger than the sum of its proper divisors (2003).

170257 is an equidigital number, since it uses as much as digits as its factorization.

170257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2002.

The product of its (nonzero) digits is 490, while the sum is 22.

The square root of 170257 is about 412.6221031404. The cubic root of 170257 is about 55.4244840449.

The spelling of 170257 in words is "one hundred seventy thousand, two hundred fifty-seven".