243994111 has 2 divisors, whose sum is σ = 243994112. Its totient is φ = 243994110.

The previous prime is 243994109. The next prime is 243994147. The reversal of 243994111 is 111499342.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 243994111 - 2¹ = 243994109 is a prime.

Together with 243994109, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243994711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121997055 + 121997056.

It is an arithmetic number, because the mean of its divisors is an integer number (121997056).

Almost surely, 2^243994111 is an apocalyptic number.

243994111 is a deficient number, since it is larger than the sum of its proper divisors (1).

243994111 is an equidigital number, since it uses as much as digits as its factorization.

243994111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 34.

The square root of 243994111 is about 15620.3108483794. The cubic root of 243994111 is about 624.8749497015.

The spelling of 243994111 in words is "two hundred forty-three million, nine hundred ninety-four thousand, one hundred eleven".