243994147 has 2 divisors, whose sum is σ = 243994148. Its totient is φ = 243994146.

The previous prime is 243994111. The next prime is 243994159. The reversal of 243994147 is 741499342.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 243994147 - 2¹⁹ = 243469859 is a prime.

It is not a weakly prime, because it can be changed into another prime (243994847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121997073 + 121997074.

It is an arithmetic number, because the mean of its divisors is an integer number (121997074).

Almost surely, 2^243994147 is an apocalyptic number.

243994147 is a deficient number, since it is larger than the sum of its proper divisors (1).

243994147 is an equidigital number, since it uses as much as digits as its factorization.

243994147 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 43.

The square root of 243994147 is about 15620.3120007252. The cubic root of 243994147 is about 624.8749804338.

The spelling of 243994147 in words is "two hundred forty-three million, nine hundred ninety-four thousand, one hundred forty-seven".