191966 has 8 divisors (see below), whose sum is σ = 293544. Its totient is φ = 94120.

The previous prime is 191953. The next prime is 191969. The reversal of 191966 is 669191.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191969) by changing a digit.

191966 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 800 + ... + 1011.

It is an arithmetic number, because the mean of its divisors is an integer number (36693).

2¹⁹¹⁹⁶⁶ is an apocalyptic number.

191966 is a deficient number, since it is larger than the sum of its proper divisors (101578).

191966 is a wasteful number, since it uses less digits than its factorization.

191966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1866.

The product of its digits is 2916, while the sum is 32.

The square root of 191966 is about 438.1392472719. The cubic root of 191966 is about 57.6865772998.

The spelling of 191966 in words is "one hundred ninety-one thousand, nine hundred sixty-six".