171257 has 4 divisors (see below), whose sum is σ = 175476. Its totient is φ = 167040.

The previous prime is 171253. The next prime is 171263. The reversal of 171257 is 752171.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 752171 = 7 ⋅107453.

It can be written as a sum of positive squares in 2 ways, for example, as 80656 + 90601 = 284^2 + 301^2 .

It is a cyclic number.

It is not a de Polignac number, because 171257 - 2² = 171253 is a prime.

It is a super-3 number, since 3×171257³ = 15068369133334779, which contains 333 as substring.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 171257.

It is not an unprimeable number, because it can be changed into a prime (171251) 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, 2048 + ... + 2129.

It is an arithmetic number, because the mean of its divisors is an integer number (43869).

2¹⁷¹²⁵⁷ is an apocalyptic number.

It is an amenable number.

171257 is a deficient number, since it is larger than the sum of its proper divisors (4219).

171257 is an equidigital number, since it uses as much as digits as its factorization.

171257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4218.

The product of its digits is 490, while the sum is 23.

The square root of 171257 is about 413.8320915541. The cubic root of 171257 is about 55.5327837043.

The spelling of 171257 in words is "one hundred seventy-one thousand, two hundred fifty-seven".