194981 has 2 divisors, whose sum is σ = 194982. Its totient is φ = 194980.

The previous prime is 194977. The next prime is 194989. The reversal of 194981 is 189491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 136900 + 58081 = 370^2 + 241^2 .

It is an emirp because it is prime and its reverse (189491) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 194981 - 2² = 194977 is a prime.

It is a super-2 number, since 2×194981² = 76035180722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 194981.

It is not a weakly prime, because it can be changed into another prime (194989) 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, 97490 + 97491.

It is an arithmetic number, because the mean of its divisors is an integer number (97491).

2¹⁹⁴⁹⁸¹ is an apocalyptic number.

It is an amenable number.

194981 is a deficient number, since it is larger than the sum of its proper divisors (1).

194981 is an equidigital number, since it uses as much as digits as its factorization.

194981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 32.

The square root of 194981 is about 441.5665295287. The cubic root of 194981 is about 57.9870165151.

The spelling of 194981 in words is "one hundred ninety-four thousand, nine hundred eighty-one".