191842243 has 2 divisors, whose sum is σ = 191842244. Its totient is φ = 191842242.

The previous prime is 191842223. The next prime is 191842271. The reversal of 191842243 is 342248191.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 191842243 - 2⁹ = 191841731 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 191842199 and 191842208.

It is not a weakly prime, because it can be changed into another prime (191842223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95921121 + 95921122.

It is an arithmetic number, because the mean of its divisors is an integer number (95921122).

Almost surely, 2^191842243 is an apocalyptic number.

191842243 is a deficient number, since it is larger than the sum of its proper divisors (1).

191842243 is an equidigital number, since it uses as much as digits as its factorization.

191842243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13824, while the sum is 34.

The square root of 191842243 is about 13850.7127253438. The cubic root of 191842243 is about 576.7417813804.

The spelling of 191842243 in words is "one hundred ninety-one million, eight hundred forty-two thousand, two hundred forty-three".