686271 has 4 divisors (see below), whose sum is σ = 915032. Its totient is φ = 457512.

The previous prime is 686269. The next prime is 686293. The reversal of 686271 is 172686.

It is a happy number.

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

It is not a de Polignac number, because 686271 - 2¹ = 686269 is a prime.

It is a D-number.

It is a Duffinian number.

686271 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114376 + ... + 114381.

It is an arithmetic number, because the mean of its divisors is an integer number (228758).

2⁶⁸⁶²⁷¹ is an apocalyptic number.

686271 is a deficient number, since it is larger than the sum of its proper divisors (228761).

686271 is a wasteful number, since it uses less digits than its factorization.

686271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228760.

The product of its digits is 4032, while the sum is 30.

The square root of 686271 is about 828.4147511965. The cubic root of 686271 is about 88.2060855217.

The spelling of 686271 in words is "six hundred eighty-six thousand, two hundred seventy-one".