194861 has 2 divisors, whose sum is σ = 194862. Its totient is φ = 194860.

The previous prime is 194839. The next prime is 194863. The reversal of 194861 is 168491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 122500 + 72361 = 350^2 + 269^2 .

It is an emirp because it is prime and its reverse (168491) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-194861 is a prime.

It is a Sophie Germain prime.

Together with 194863, 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 a congruent number.

It is not a weakly prime, because it can be changed into another prime (194863) 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, 97430 + 97431.

It is an arithmetic number, because the mean of its divisors is an integer number (97431).

2¹⁹⁴⁸⁶¹ is an apocalyptic number.

It is an amenable number.

194861 is a deficient number, since it is larger than the sum of its proper divisors (1).

194861 is an equidigital number, since it uses as much as digits as its factorization.

194861 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 194861 is about 441.4306287516. The cubic root of 194861 is about 57.9751181422.

It can be divided in two parts, 1948 and 61, that multiplied together give a triangular number (118828 = T₄₈₇).

The spelling of 194861 in words is "one hundred ninety-four thousand, eight hundred sixty-one".