191223223 has 4 divisors (see below), whose sum is σ = 191934360. Its totient is φ = 190512088.

The previous prime is 191223217. The next prime is 191223247. The reversal of 191223223 is 322322191.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 322322191 = 167 ⋅1930073.

It is a cyclic number.

It is not a de Polignac number, because 191223223 - 2⁹ = 191222711 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191223203) 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, 355165 + ... + 355702.

It is an arithmetic number, because the mean of its divisors is an integer number (47983590).

Almost surely, 2^191223223 is an apocalyptic number.

191223223 is a deficient number, since it is larger than the sum of its proper divisors (711137).

191223223 is an equidigital number, since it uses as much as digits as its factorization.

191223223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 711136.

The product of its digits is 1296, while the sum is 25.

The square root of 191223223 is about 13828.3485275719. The cubic root of 191223223 is about 576.1207861006.

The spelling of 191223223 in words is "one hundred ninety-one million, two hundred twenty-three thousand, two hundred twenty-three".