206161 has 4 divisors (see below), whose sum is σ = 213300. Its totient is φ = 199024.

The previous prime is 206153. The next prime is 206177. The reversal of 206161 is 161602.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 65536 + 140625 = 256^2 + 375^2 .

It is a cyclic number.

It is not a de Polignac number, because 206161 - 2³ = 206153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3526 + ... + 3583.

It is an arithmetic number, because the mean of its divisors is an integer number (53325).

2²⁰⁶¹⁶¹ is an apocalyptic number.

It is an amenable number.

206161 is a deficient number, since it is larger than the sum of its proper divisors (7139).

206161 is an equidigital number, since it uses as much as digits as its factorization.

206161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7138.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 206161 is about 454.0495567667. The cubic root of 206161 is about 59.0747878561.

Adding to 206161 its reverse (161602), we get a palindrome (367763).

The spelling of 206161 in words is "two hundred six thousand, one hundred sixty-one".