243138463 has 2 divisors, whose sum is σ = 243138464. Its totient is φ = 243138462.

The previous prime is 243138443. The next prime is 243138479. The reversal of 243138463 is 364831342.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 243138463 - 2²⁵ = 209584031 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243138443) 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, 121569231 + 121569232.

It is an arithmetic number, because the mean of its divisors is an integer number (121569232).

Almost surely, 2^243138463 is an apocalyptic number.

243138463 is a deficient number, since it is larger than the sum of its proper divisors (1).

243138463 is an equidigital number, since it uses as much as digits as its factorization.

243138463 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41472, while the sum is 34.

The square root of 243138463 is about 15592.8978384391. The cubic root of 243138463 is about 624.1436489565.

The spelling of 243138463 in words is "two hundred forty-three million, one hundred thirty-eight thousand, four hundred sixty-three".