243936013 has 2 divisors, whose sum is σ = 243936014. Its totient is φ = 243936012.

The previous prime is 243935983. The next prime is 243936029. The reversal of 243936013 is 310639342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 182439049 + 61496964 = 13507^2 + 7842^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243936013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243936713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121968006 + 121968007.

It is an arithmetic number, because the mean of its divisors is an integer number (121968007).

Almost surely, 2^243936013 is an apocalyptic number.

It is an amenable number.

243936013 is a deficient number, since it is larger than the sum of its proper divisors (1).

243936013 is an equidigital number, since it uses as much as digits as its factorization.

243936013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 31.

The square root of 243936013 is about 15618.4510435574. The cubic root of 243936013 is about 624.8253489598.

The spelling of 243936013 in words is "two hundred forty-three million, nine hundred thirty-six thousand, thirteen".