685165 has 16 divisors (see below), whose sum is σ = 903168. Its totient is φ = 495936.

The previous prime is 685141. The next prime is 685169. The reversal of 685165 is 561586.

It is a cyclic number.

It is not a de Polignac number, because 685165 - 2¹⁹ = 160877 is a prime.

It is a Duffinian number.

It is a congruent number.

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

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5332 + ... + 5458.

It is an arithmetic number, because the mean of its divisors is an integer number (56448).

2⁶⁸⁵¹⁶⁵ is an apocalyptic number.

685165 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

685165 is a deficient number, since it is larger than the sum of its proper divisors (218003).

685165 is a wasteful number, since it uses less digits than its factorization.

685165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228.

The product of its digits is 7200, while the sum is 31.

The square root of 685165 is about 827.7469420058. The cubic root of 685165 is about 88.1586754923.

The spelling of 685165 in words is "six hundred eighty-five thousand, one hundred sixty-five".