191923 has 4 divisors (see below), whose sum is σ = 192888. Its totient is φ = 190960.

The previous prime is 191911. The next prime is 191929. The reversal of 191923 is 329191.

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 a de Polignac number, because none of the positive numbers 2^k-191923 is a prime.

It is a Duffinian number.

191923 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (191929) 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, 61 + ... + 622.

It is an arithmetic number, because the mean of its divisors is an integer number (48222).

2¹⁹¹⁹²³ is an apocalyptic number.

191923 is a deficient number, since it is larger than the sum of its proper divisors (965).

191923 is an equidigital number, since it uses as much as digits as its factorization.

191923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 964.

The product of its digits is 486, while the sum is 25.

The square root of 191923 is about 438.0901733662. The cubic root of 191923 is about 57.6822697522.

The spelling of 191923 in words is "one hundred ninety-one thousand, nine hundred twenty-three".