242722817 has 2 divisors, whose sum is σ = 242722818. Its totient is φ = 242722816.

The previous prime is 242722813. The next prime is 242722819. The reversal of 242722817 is 718227242.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 227285776 + 15437041 = 15076^2 + 3929^2 .

It is a cyclic number.

It is not a de Polignac number, because 242722817 - 2² = 242722813 is a prime.

Together with 242722819, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (242722813) 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, 121361408 + 121361409.

It is an arithmetic number, because the mean of its divisors is an integer number (121361409).

Almost surely, 2^242722817 is an apocalyptic number.

It is an amenable number.

242722817 is a deficient number, since it is larger than the sum of its proper divisors (1).

242722817 is an equidigital number, since it uses as much as digits as its factorization.

242722817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25088, while the sum is 35.

The square root of 242722817 is about 15579.5640824768. The cubic root of 242722817 is about 623.7877875590.

The spelling of 242722817 in words is "two hundred forty-two million, seven hundred twenty-two thousand, eight hundred seventeen".