685161 has 6 divisors (see below), whose sum is σ = 989690. Its totient is φ = 456768.

The previous prime is 685141. The next prime is 685169. The reversal of 685161 is 161586.

685161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 670761 + 14400 = 819^2 + 120^2 .

It is not a de Polignac number, because 685161 - 2¹⁷ = 554089 is a prime.

It is a Duffinian number.

It is a Curzon number.

685161 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (685169) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 38056 + ... + 38073.

2⁶⁸⁵¹⁶¹ is an apocalyptic number.

It is an amenable number.

685161 is a deficient number, since it is larger than the sum of its proper divisors (304529).

685161 is a wasteful number, since it uses less digits than its factorization.

685161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76135 (or 76132 counting only the distinct ones).

The product of its digits is 1440, while the sum is 27.

The square root of 685161 is about 827.7445258049. The cubic root of 685161 is about 88.1585039349.

The spelling of 685161 in words is "six hundred eighty-five thousand, one hundred sixty-one".