195911 has 4 divisors (see below), whose sum is σ = 196800. Its totient is φ = 195024.

The previous prime is 195907. The next prime is 195913. The reversal of 195911 is 119591.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 195911 - 2² = 195907 is a prime.

It is a super-2 number, since 2×195911² = 76762239842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195913) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 170 + ... + 648.

It is an arithmetic number, because the mean of its divisors is an integer number (49200).

2¹⁹⁵⁹¹¹ is an apocalyptic number.

195911 is a deficient number, since it is larger than the sum of its proper divisors (889).

195911 is an equidigital number, since it uses as much as digits as its factorization.

195911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 888.

The product of its digits is 405, while the sum is 26.

The square root of 195911 is about 442.6183457563. The cubic root of 195911 is about 58.0790637948.

The spelling of 195911 in words is "one hundred ninety-five thousand, nine hundred eleven".