195681 has 8 divisors (see below), whose sum is σ = 274720. Its totient is φ = 123552.

The previous prime is 195677. The next prime is 195691. The reversal of 195681 is 186591.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 195681 - 2² = 195677 is a prime.

It is a super-2 number, since 2×195681² = 76582107522, which contains 22 as substring.

It is a Duffinian number.

195681 is a lucky number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 195681.

It is not an unprimeable number, because it can be changed into a prime (195691) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1660 + ... + 1773.

It is an arithmetic number, because the mean of its divisors is an integer number (34340).

2¹⁹⁵⁶⁸¹ is an apocalyptic number.

It is an amenable number.

195681 is a deficient number, since it is larger than the sum of its proper divisors (79039).

195681 is a wasteful number, since it uses less digits than its factorization.

195681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3455.

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

The square root of 195681 is about 442.3584519369. The cubic root of 195681 is about 58.0563265730.

The spelling of 195681 in words is "one hundred ninety-five thousand, six hundred eighty-one".