196891 has 4 divisors (see below), whose sum is σ = 197784. Its totient is φ = 196000.

The previous prime is 196879. The next prime is 196901. The reversal of 196891 is 198691.

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, and also an emirpimes, since its reverse is a distinct semiprime: 198691 = 431 ⋅461.

It is a cyclic number.

It is not a de Polignac number, because 196891 - 2⁹ = 196379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (196831) 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, 156 + ... + 646.

It is an arithmetic number, because the mean of its divisors is an integer number (49446).

2¹⁹⁶⁸⁹¹ is an apocalyptic number.

196891 is a deficient number, since it is larger than the sum of its proper divisors (893).

196891 is an equidigital number, since it uses as much as digits as its factorization.

196891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 892.

The product of its digits is 3888, while the sum is 34.

The square root of 196891 is about 443.7240133236. The cubic root of 196891 is about 58.1757451787.

The spelling of 196891 in words is "one hundred ninety-six thousand, eight hundred ninety-one".