242743321 has 2 divisors, whose sum is σ = 242743322. Its totient is φ = 242743320.

The previous prime is 242743307. The next prime is 242743337. The reversal of 242743321 is 123347242.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 238270096 + 4473225 = 15436^2 + 2115^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-242743321 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 242743321.

It is not a weakly prime, because it can be changed into another prime (242743381) 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, 121371660 + 121371661.

It is an arithmetic number, because the mean of its divisors is an integer number (121371661).

Almost surely, 2^242743321 is an apocalyptic number.

It is an amenable number.

242743321 is a deficient number, since it is larger than the sum of its proper divisors (1).

242743321 is an equidigital number, since it uses as much as digits as its factorization.

242743321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 28.

The square root of 242743321 is about 15580.2221100984. Note that the first 3 decimals coincide. The cubic root of 242743321 is about 623.8053518803.

The spelling of 242743321 in words is "two hundred forty-two million, seven hundred forty-three thousand, three hundred twenty-one".