243123113 has 2 divisors, whose sum is σ = 243123114. Its totient is φ = 243123112.

The previous prime is 243123091. The next prime is 243123119. The reversal of 243123113 is 311321342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 202009369 + 41113744 = 14213^2 + 6412^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243123113 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (243123119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121561556 + 121561557.

It is an arithmetic number, because the mean of its divisors is an integer number (121561557).

Almost surely, 2^243123113 is an apocalyptic number.

It is an amenable number.

243123113 is a deficient number, since it is larger than the sum of its proper divisors (1).

243123113 is an equidigital number, since it uses as much as digits as its factorization.

243123113 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432, while the sum is 20.

The square root of 243123113 is about 15592.4056194033. The cubic root of 243123113 is about 624.1305140449.

Adding to 243123113 its reverse (311321342), we get a palindrome (554444455).

The spelling of 243123113 in words is "two hundred forty-three million, one hundred twenty-three thousand, one hundred thirteen".