243012191 has 2 divisors, whose sum is σ = 243012192. Its totient is φ = 243012190.

The previous prime is 243012173. The next prime is 243012239. The reversal of 243012191 is 191210342.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 243012191 - 2¹⁸ = 242750047 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243012101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121506095 + 121506096.

It is an arithmetic number, because the mean of its divisors is an integer number (121506096).

Almost surely, 2^243012191 is an apocalyptic number.

243012191 is a deficient number, since it is larger than the sum of its proper divisors (1).

243012191 is an equidigital number, since it uses as much as digits as its factorization.

243012191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 243012191 is about 15588.8482897230. The cubic root of 243012191 is about 624.0355822562.

The spelling of 243012191 in words is "two hundred forty-three million, twelve thousand, one hundred ninety-one".