186161 has 2 divisors, whose sum is σ = 186162. Its totient is φ = 186160.

The previous prime is 186157. The next prime is 186163. The reversal of 186161 is 161681.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 185761 + 400 = 431^2 + 20^2 .

It is a cyclic number.

It is not a de Polignac number, because 186161 - 2² = 186157 is a prime.

Together with 186163, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (186163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 93080 + 93081.

It is an arithmetic number, because the mean of its divisors is an integer number (93081).

2¹⁸⁶¹⁶¹ is an apocalyptic number.

It is an amenable number.

186161 is a deficient number, since it is larger than the sum of its proper divisors (1).

186161 is an equidigital number, since it uses as much as digits as its factorization.

186161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 288, while the sum is 23.

The square root of 186161 is about 431.4637875883. The cubic root of 186161 is about 57.0991400747.

The spelling of 186161 in words is "one hundred eighty-six thousand, one hundred sixty-one".