206181 has 12 divisors (see below), whose sum is σ = 307840. Its totient is φ = 132840.

The previous prime is 206179. The next prime is 206183. The reversal of 206181 is 181602.

206181 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (206179) and next prime (206183).

It is not a de Polignac number, because 206181 - 2¹ = 206179 is a prime.

It is a super-2 number, since 2×206181² = 85021209522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 206181.

It is not an unprimeable number, because it can be changed into a prime (206183) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 91 + ... + 648.

2²⁰⁶¹⁸¹ is an apocalyptic number.

It is an amenable number.

206181 is a deficient number, since it is larger than the sum of its proper divisors (101659).

206181 is a wasteful number, since it uses less digits than its factorization.

206181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 776 (or 773 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 206181 is about 454.0715802602. The cubic root of 206181 is about 59.0766981067.

Adding to 206181 its reverse (181602), we get a palindrome (387783).

The spelling of 206181 in words is "two hundred six thousand, one hundred eighty-one".