242686681 has 2 divisors, whose sum is σ = 242686682. Its totient is φ = 242686680.

The previous prime is 242686637. The next prime is 242686687. The reversal of 242686681 is 186686242.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 227406400 + 15280281 = 15080^2 + 3909^2 .

It is a cyclic number.

It is not a de Polignac number, because 242686681 - 2⁷ = 242686553 is a prime.

It is a super-2 number, since 2×242686681² = 117793650269591522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (242686687) 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, 121343340 + 121343341.

It is an arithmetic number, because the mean of its divisors is an integer number (121343341).

Almost surely, 2^242686681 is an apocalyptic number.

It is an amenable number.

242686681 is a deficient number, since it is larger than the sum of its proper divisors (1).

242686681 is an equidigital number, since it uses as much as digits as its factorization.

242686681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 221184, while the sum is 43.

The square root of 242686681 is about 15578.4043149483. The cubic root of 242686681 is about 623.7568300049.

The spelling of 242686681 in words is "two hundred forty-two million, six hundred eighty-six thousand, six hundred eighty-one".