201161 has 4 divisors (see below), whose sum is σ = 213012. Its totient is φ = 189312.

The previous prime is 201151. The next prime is 201163. The reversal of 201161 is 161102.

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 175561 + 25600 = 419^2 + 160^2 .

It is not a de Polignac number, because 201161 - 2¹⁴ = 184777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201163) 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, 5900 + ... + 5933.

It is an arithmetic number, because the mean of its divisors is an integer number (53253).

2²⁰¹¹⁶¹ is an apocalyptic number.

It is an amenable number.

201161 is a deficient number, since it is larger than the sum of its proper divisors (11851).

201161 is a wasteful number, since it uses less digits than its factorization.

201161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11850.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 201161 is about 448.5097546319. The cubic root of 201161 is about 58.5932959906.

Adding to 201161 its reverse (161102), we get a palindrome (362263).

It can be divided in two parts, 20 and 1161, that multiplied together give a triangular number (23220 = T₂₁₅).

The spelling of 201161 in words is "two hundred one thousand, one hundred sixty-one".