194581 has 2 divisors, whose sum is σ = 194582. Its totient is φ = 194580.

The previous prime is 194569. The next prime is 194591. The reversal of 194581 is 185491.

It is a happy number.

194581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

194581 is an esthetic number in base 11, because in such base its adjacent digits differ by 1.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 194481 + 100 = 441^2 + 10^2 .

It is an emirp because it is prime and its reverse (185491) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 194581 - 2⁹ = 194069 is a prime.

It is a super-2 number, since 2×194581² = 75723531122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (194521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97290 + 97291.

It is an arithmetic number, because the mean of its divisors is an integer number (97291).

2¹⁹⁴⁵⁸¹ is an apocalyptic number.

It is an amenable number.

194581 is a deficient number, since it is larger than the sum of its proper divisors (1).

194581 is an equidigital number, since it uses as much as digits as its factorization.

194581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1440, while the sum is 28.

The square root of 194581 is about 441.1133641140. The cubic root of 194581 is about 57.9473362626.

The spelling of 194581 in words is "one hundred ninety-four thousand, five hundred eighty-one".