242399813 has 2 divisors, whose sum is σ = 242399814. Its totient is φ = 242399812.

The previous prime is 242399809. The next prime is 242399827. The reversal of 242399813 is 318993242.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 232044289 + 10355524 = 15233^2 + 3218^2 .

It is a cyclic number.

It is not a de Polignac number, because 242399813 - 2² = 242399809 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (242399513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121199906 + 121199907.

It is an arithmetic number, because the mean of its divisors is an integer number (121199907).

Almost surely, 2^242399813 is an apocalyptic number.

It is an amenable number.

242399813 is a deficient number, since it is larger than the sum of its proper divisors (1).

242399813 is an equidigital number, since it uses as much as digits as its factorization.

242399813 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 242399813 is about 15569.1943593752. The cubic root of 242399813 is about 623.5109623376.

The spelling of 242399813 in words is "two hundred forty-two million, three hundred ninety-nine thousand, eight hundred thirteen".