686281 has 4 divisors (see below), whose sum is σ = 696592. Its totient is φ = 675972.

The previous prime is 686269. The next prime is 686293. The reversal of 686281 is 182686.

686281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (686269) and next prime (686293).

It is a cyclic number.

It is not a de Polignac number, because 686281 - 2¹⁷ = 555209 is a prime.

It is a super-2 number, since 2×686281² = 941963221922, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a nialpdrome in base 7 and base 15.

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5055 + ... + 5188.

It is an arithmetic number, because the mean of its divisors is an integer number (174148).

2⁶⁸⁶²⁸¹ is an apocalyptic number.

It is an amenable number.

686281 is a deficient number, since it is larger than the sum of its proper divisors (10311).

686281 is a wasteful number, since it uses less digits than its factorization.

686281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10310.

The product of its digits is 4608, while the sum is 31.

The square root of 686281 is about 828.4207867986. The cubic root of 686281 is about 88.2065139513.

The spelling of 686281 in words is "six hundred eighty-six thousand, two hundred eighty-one".