194681 has 2 divisors, whose sum is σ = 194682. Its totient is φ = 194680.

The previous prime is 194671. The next prime is 194683. The reversal of 194681 is 186491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 116281 + 78400 = 341^2 + 280^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-194681 is a prime.

It is a super-2 number, since 2×194681² = 75801383522, which contains 22 as substring.

Together with 194683, it forms a pair of twin primes.

It is a Chen prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 194681.

It is not a weakly prime, because it can be changed into another prime (194683) by changing a digit.

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

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97340 + 97341.

It is an arithmetic number, because the mean of its divisors is an integer number (97341).

2¹⁹⁴⁶⁸¹ is an apocalyptic number.

It is an amenable number.

194681 is a deficient number, since it is larger than the sum of its proper divisors (1).

194681 is an equidigital number, since it uses as much as digits as its factorization.

194681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 29.

The square root of 194681 is about 441.2266991015. The cubic root of 194681 is about 57.9572614201.

The spelling of 194681 in words is "one hundred ninety-four thousand, six hundred eighty-one".