195934181 has 2 divisors, whose sum is σ = 195934182. Its totient is φ = 195934180.

The previous prime is 195934157. The next prime is 195934183. The reversal of 195934181 is 181439591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 109537156 + 86397025 = 10466^2 + 9295^2 .

It is a cyclic number.

It is not a de Polignac number, because 195934181 - 2²⁶ = 128825317 is a prime.

It is a super-2 number, since 2×195934181² = 76780406568281522, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 195934183, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (195934183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97967090 + 97967091.

It is an arithmetic number, because the mean of its divisors is an integer number (97967091).

Almost surely, 2^195934181 is an apocalyptic number.

It is an amenable number.

195934181 is a deficient number, since it is larger than the sum of its proper divisors (1).

195934181 is an equidigital number, since it uses as much as digits as its factorization.

195934181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38880, while the sum is 41.

The square root of 195934181 is about 13997.6491240494. The cubic root of 195934181 is about 580.8135442283.

The spelling of 195934181 in words is "one hundred ninety-five million, nine hundred thirty-four thousand, one hundred eighty-one".