242278681 has 2 divisors, whose sum is σ = 242278682. Its totient is φ = 242278680.

The previous prime is 242278661. The next prime is 242278691. The reversal of 242278681 is 186872242.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 221265625 + 21013056 = 14875^2 + 4584^2 .

It is a cyclic number.

It is not a de Polignac number, because 242278681 - 2⁵ = 242278649 is a prime.

It is a super-2 number, since 2×242278681² = 117397918534199522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (242278651) 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, 121139340 + 121139341.

It is an arithmetic number, because the mean of its divisors is an integer number (121139341).

Almost surely, 2^242278681 is an apocalyptic number.

It is an amenable number.

242278681 is a deficient number, since it is larger than the sum of its proper divisors (1).

242278681 is an equidigital number, since it uses as much as digits as its factorization.

242278681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 86016, while the sum is 40.

The square root of 242278681 is about 15565.3037554684. The cubic root of 242278681 is about 623.4070847627.

The spelling of 242278681 in words is "two hundred forty-two million, two hundred seventy-eight thousand, six hundred eighty-one".