243024139 has 2 divisors, whose sum is σ = 243024140. Its totient is φ = 243024138.

The previous prime is 243024137. The next prime is 243024143. The reversal of 243024139 is 931420342.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 243024139 - 2¹ = 243024137 is a prime.

Together with 243024137, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (243024137) 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, 121512069 + 121512070.

It is an arithmetic number, because the mean of its divisors is an integer number (121512070).

Almost surely, 2^243024139 is an apocalyptic number.

243024139 is a deficient number, since it is larger than the sum of its proper divisors (1).

243024139 is an equidigital number, since it uses as much as digits as its factorization.

243024139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 243024139 is about 15589.2315076786. The cubic root of 243024139 is about 624.0458092534.

It can be divided in two parts, 24302 and 4139, that added together give a triangular number (28441 = T₂₃₈).

The spelling of 243024139 in words is "two hundred forty-three million, twenty-four thousand, one hundred thirty-nine".