243138479 has 2 divisors, whose sum is σ = 243138480. Its totient is φ = 243138478.

The previous prime is 243138463. The next prime is 243138491. The reversal of 243138479 is 974831342.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 243138479 - 2⁴ = 243138463 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 (243138409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121569239 + 121569240.

It is an arithmetic number, because the mean of its divisors is an integer number (121569240).

Almost surely, 2^243138479 is an apocalyptic number.

243138479 is a deficient number, since it is larger than the sum of its proper divisors (1).

243138479 is an equidigital number, since it uses as much as digits as its factorization.

243138479 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 41.

The square root of 243138479 is about 15592.8983514932. The cubic root of 243138479 is about 624.1436626473.

The spelling of 243138479 in words is "two hundred forty-three million, one hundred thirty-eight thousand, four hundred seventy-nine".