195891 has 16 divisors (see below), whose sum is σ = 290304. Its totient is φ = 116864.

The previous prime is 195887. The next prime is 195893. The reversal of 195891 is 198591.

It is a cyclic number.

It is not a de Polignac number, because 195891 - 2² = 195887 is a prime.

It is a nialpdrome in base 12.

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 195891.

It is not an unprimeable number, because it can be changed into a prime (195893) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1090 + ... + 1256.

It is an arithmetic number, because the mean of its divisors is an integer number (18144).

2¹⁹⁵⁸⁹¹ is an apocalyptic number.

195891 is a deficient number, since it is larger than the sum of its proper divisors (94413).

195891 is a wasteful number, since it uses less digits than its factorization.

195891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210.

The product of its digits is 3240, while the sum is 33.

The square root of 195891 is about 442.5957523520. The cubic root of 195891 is about 58.0770873518.

The spelling of 195891 in words is "one hundred ninety-five thousand, eight hundred ninety-one".