242939813 has 2 divisors, whose sum is σ = 242939814. Its totient is φ = 242939812.

The previous prime is 242939779. The next prime is 242939819. The reversal of 242939813 is 318939242.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 137405284 + 105534529 = 11722^2 + 10273^2 .

It is a cyclic number.

It is not a de Polignac number, because 242939813 - 2¹² = 242935717 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (242939819) 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, 121469906 + 121469907.

It is an arithmetic number, because the mean of its divisors is an integer number (121469907).

Almost surely, 2^242939813 is an apocalyptic number.

It is an amenable number.

242939813 is a deficient number, since it is larger than the sum of its proper divisors (1).

242939813 is an equidigital number, since it uses as much as digits as its factorization.

242939813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 93312, while the sum is 41.

The square root of 242939813 is about 15586.5266496420. The cubic root of 242939813 is about 623.9736224947.

The spelling of 242939813 in words is "two hundred forty-two million, nine hundred thirty-nine thousand, eight hundred thirteen".