27161 has 4 divisors (see below), whose sum is σ = 27492. Its totient is φ = 26832.

The previous prime is 27143. The next prime is 27179. The reversal of 27161 is 16172.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (27143) and next prime (27179).

It can be written as a sum of positive squares in 2 ways, for example, as 17161 + 10000 = 131^2 + 100^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27161 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (27191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71 + ... + 243.

It is an arithmetic number, because the mean of its divisors is an integer number (6873).

2²⁷¹⁶¹ is an apocalyptic number.

It is an amenable number.

27161 is a deficient number, since it is larger than the sum of its proper divisors (331).

27161 is a wasteful number, since it uses less digits than its factorization.

27161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330.

The product of its digits is 84, while the sum is 17.

The square root of 27161 is about 164.8059464947. The cubic root of 27161 is about 30.0595114976.

The spelling of 27161 in words is "twenty-seven thousand, one hundred sixty-one".