194591 has 2 divisors, whose sum is σ = 194592. Its totient is φ = 194590.

The previous prime is 194581. The next prime is 194609. The reversal of 194591 is 195491.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 194591 - 2⁶ = 194527 is a prime.

It is a Chen prime.

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 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, 97295 + 97296.

It is an arithmetic number, because the mean of its divisors is an integer number (97296).

2¹⁹⁴⁵⁹¹ is an apocalyptic number.

194591 is a deficient number, since it is larger than the sum of its proper divisors (1).

194591 is an equidigital number, since it uses as much as digits as its factorization.

194591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1620, while the sum is 29.

The square root of 194591 is about 441.1246989231. The cubic root of 194591 is about 57.9483289314.

Subtracting 194591 from its reverse (195491), we obtain a square (900 = 30²).

The spelling of 194591 in words is "one hundred ninety-four thousand, five hundred ninety-one".