243213263 has 2 divisors, whose sum is σ = 243213264. Its totient is φ = 243213262.

The previous prime is 243213239. The next prime is 243213277. The reversal of 243213263 is 362312342.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 243213263 - 2⁶ = 243213199 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243218263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121606631 + 121606632.

It is an arithmetic number, because the mean of its divisors is an integer number (121606632).

Almost surely, 2^243213263 is an apocalyptic number.

243213263 is a deficient number, since it is larger than the sum of its proper divisors (1).

243213263 is an equidigital number, since it uses as much as digits as its factorization.

243213263 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 26.

The square root of 243213263 is about 15595.2961818620. The cubic root of 243213263 is about 624.2076470006.

The spelling of 243213263 in words is "two hundred forty-three million, two hundred thirteen thousand, two hundred sixty-three".