195861 has 4 divisors (see below), whose sum is σ = 261152. Its totient is φ = 130572.

The previous prime is 195817. The next prime is 195863. The reversal of 195861 is 168591.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 168591 = 3 ⋅56197.

It is not a de Polignac number, because 195861 - 2⁷ = 195733 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195863) 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 in 3 ways as a sum of consecutive naturals, for example, 32641 + ... + 32646.

It is an arithmetic number, because the mean of its divisors is an integer number (65288).

2¹⁹⁵⁸⁶¹ is an apocalyptic number.

It is an amenable number.

195861 is a deficient number, since it is larger than the sum of its proper divisors (65291).

195861 is an equidigital number, since it uses as much as digits as its factorization.

195861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65290.

The product of its digits is 2160, while the sum is 30.

The square root of 195861 is about 442.5618600829. The cubic root of 195861 is about 58.0741224349.

The spelling of 195861 in words is "one hundred ninety-five thousand, eight hundred sixty-one".