243113813 has 2 divisors, whose sum is σ = 243113814. Its totient is φ = 243113812.

The previous prime is 243113779. The next prime is 243113851. The reversal of 243113813 is 318311342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 227919409 + 15194404 = 15097^2 + 3898^2 .

It is a cyclic number.

It is not a de Polignac number, because 243113813 - 2¹² = 243109717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243113863) 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, 121556906 + 121556907.

It is an arithmetic number, because the mean of its divisors is an integer number (121556907).

Almost surely, 2^243113813 is an apocalyptic number.

It is an amenable number.

243113813 is a deficient number, since it is larger than the sum of its proper divisors (1).

243113813 is an equidigital number, since it uses as much as digits as its factorization.

243113813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 26.

The square root of 243113813 is about 15592.1073944480. The cubic root of 243113813 is about 624.1225558165.

The spelling of 243113813 in words is "two hundred forty-three million, one hundred thirteen thousand, eight hundred thirteen".