194561 has 4 divisors (see below), whose sum is σ = 201300. Its totient is φ = 187824.

The previous prime is 194543. The next prime is 194569. The reversal of 194561 is 165491.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 165491 = 73 ⋅2267.

It can be written as a sum of positive squares in 2 ways, for example, as 115600 + 78961 = 340^2 + 281^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-194561 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 194561.

It is not an unprimeable number, because it can be changed into a prime (194569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3326 + ... + 3383.

It is an arithmetic number, because the mean of its divisors is an integer number (50325).

It is a Proth number, since it is equal to 95 ⋅ 2¹¹ + 1 and 95 < 2¹¹.

2¹⁹⁴⁵⁶¹ is an apocalyptic number.

It is an amenable number.

194561 is a deficient number, since it is larger than the sum of its proper divisors (6739).

194561 is an equidigital number, since it uses as much as digits as its factorization.

194561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6738.

The product of its digits is 1080, while the sum is 26.

The square root of 194561 is about 441.0906936221. The cubic root of 194561 is about 57.9453508231.

The spelling of 194561 in words is "one hundred ninety-four thousand, five hundred sixty-one".