191243 has 8 divisors (see below), whose sum is σ = 211008. Its totient is φ = 172224.

The previous prime is 191237. The next prime is 191249. The reversal of 191243 is 342191.

It is an interprime number because it is at equal distance from previous prime (191237) and next prime (191249).

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

It is not a de Polignac number, because 191243 - 2⁴ = 191227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (191249) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 455 + ... + 767.

It is an arithmetic number, because the mean of its divisors is an integer number (26376).

2¹⁹¹²⁴³ is an apocalyptic number.

191243 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

191243 is a deficient number, since it is larger than the sum of its proper divisors (19765).

191243 is a wasteful number, since it uses less digits than its factorization.

191243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373.

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

The square root of 191243 is about 437.3133887729. The cubic root of 191243 is about 57.6140646917.

It can be divided in two parts, 191 and 243, that added together give a palindrome (434).

The spelling of 191243 in words is "one hundred ninety-one thousand, two hundred forty-three".