686161 has 8 divisors (see below), whose sum is σ = 794304. Its totient is φ = 580560.

The previous prime is 686149. The next prime is 686173. The reversal of 686161 is 161686.

It is an interprime number because it is at equal distance from previous prime (686149) and next prime (686173).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 686161 - 2⁹ = 685649 is a prime.

It is a nialpdrome in base 7.

It is not an unprimeable number, because it can be changed into a prime (686131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10 + ... + 1171.

It is an arithmetic number, because the mean of its divisors is an integer number (99288).

2⁶⁸⁶¹⁶¹ is an apocalyptic number.

It is an amenable number.

686161 is a deficient number, since it is larger than the sum of its proper divisors (108143).

686161 is a wasteful number, since it uses less digits than its factorization.

686161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1271.

The product of its digits is 1728, while the sum is 28.

The square root of 686161 is about 828.3483566713. The cubic root of 686161 is about 88.2013725206.

The spelling of 686161 in words is "six hundred eighty-six thousand, one hundred sixty-one".