195161 has 2 divisors, whose sum is σ = 195162. Its totient is φ = 195160.

The previous prime is 195157. The next prime is 195163. The reversal of 195161 is 161591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 175561 + 19600 = 419^2 + 140^2 .

It is an emirp because it is prime and its reverse (161591) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 195161 - 2² = 195157 is a prime.

It is a Sophie Germain prime.

Together with 195163, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a plaindrome in base 11.

It is not a weakly prime, because it can be changed into another prime (195163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97580 + 97581.

It is an arithmetic number, because the mean of its divisors is an integer number (97581).

2¹⁹⁵¹⁶¹ is an apocalyptic number.

It is an amenable number.

195161 is a deficient number, since it is larger than the sum of its proper divisors (1).

195161 is an equidigital number, since it uses as much as digits as its factorization.

195161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 270, while the sum is 23.

The square root of 195161 is about 441.7703023065. The cubic root of 195161 is about 58.0048549246.

The spelling of 195161 in words is "one hundred ninety-five thousand, one hundred sixty-one".