191963 has 4 divisors (see below), whose sum is σ = 194040. Its totient is φ = 189888.

The previous prime is 191953. The next prime is 191969. The reversal of 191963 is 369191.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 191963 - 2⁶ = 191899 is a prime.

It is a Duffinian number.

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

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, 893 + ... + 1086.

It is an arithmetic number, because the mean of its divisors is an integer number (48510).

2¹⁹¹⁹⁶³ is an apocalyptic number.

191963 is a deficient number, since it is larger than the sum of its proper divisors (2077).

191963 is an equidigital number, since it uses as much as digits as its factorization.

191963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2076.

The product of its digits is 1458, while the sum is 29.

The square root of 191963 is about 438.1358236894. The cubic root of 191963 is about 57.6862767941.

The spelling of 191963 in words is "one hundred ninety-one thousand, nine hundred sixty-three".