191423 has 4 divisors (see below), whose sum is σ = 193320. Its totient is φ = 189528.

The previous prime is 191413. The next prime is 191441. The reversal of 191423 is 324191.

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 191423 - 2¹⁴ = 175039 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 191395 and 191404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191413) 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, 788 + ... + 1001.

It is an arithmetic number, because the mean of its divisors is an integer number (48330).

2¹⁹¹⁴²³ is an apocalyptic number.

191423 is a deficient number, since it is larger than the sum of its proper divisors (1897).

191423 is a wasteful number, since it uses less digits than its factorization.

191423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1896.

The product of its digits is 216, while the sum is 20.

The square root of 191423 is about 437.5191424384. The cubic root of 191423 is about 57.6321346859.

The spelling of 191423 in words is "one hundred ninety-one thousand, four hundred twenty-three".