201685 has 16 divisors (see below), whose sum is σ = 279360. Its totient is φ = 138240.

The previous prime is 201683. The next prime is 201701. The reversal of 201685 is 586102.

201685 = T₅₄ + T₅₅ + ... + T₁₁₀.

It is a happy number.

It is not a de Polignac number, because 201685 - 2¹ = 201683 is a prime.

201685 is a lucky number.

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201683) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 949 + ... + 1141.

It is an arithmetic number, because the mean of its divisors is an integer number (17460).

2²⁰¹⁶⁸⁵ is an apocalyptic number.

It is an amenable number.

201685 is a deficient number, since it is larger than the sum of its proper divisors (77675).

201685 is a wasteful number, since it uses less digits than its factorization.

201685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 201685 is about 449.0935314609. The cubic root of 201685 is about 58.6441280215.

Adding to 201685 its reverse (586102), we get a palindrome (787787).

The spelling of 201685 in words is "two hundred one thousand, six hundred eighty-five".