687171 has 12 divisors (see below), whose sum is σ = 960008. Its totient is φ = 437184.

The previous prime is 687163. The next prime is 687179. The reversal of 687171 is 171786.

687171 = 99² + 100² + ... + 144².

687171 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (687163) and next prime (687179).

It is not a de Polignac number, because 687171 - 2³ = 687163 is a prime.

It is a Duffinian number.

687171 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (687179) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1371 + ... + 1803.

2⁶⁸⁷¹⁷¹ is an apocalyptic number.

687171 is a deficient number, since it is larger than the sum of its proper divisors (272837).

687171 is a wasteful number, since it uses less digits than its factorization.

687171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 482 (or 459 counting only the distinct ones).

The product of its digits is 2352, while the sum is 30.

The square root of 687171 is about 828.9577793832. The cubic root of 687171 is about 88.2446275356.

It can be divided in two parts, 687 and 171, that added together give a palindrome (858).

The spelling of 687171 in words is "six hundred eighty-seven thousand, one hundred seventy-one".