242129681 has 2 divisors, whose sum is σ = 242129682. Its totient is φ = 242129680.

The previous prime is 242129659. The next prime is 242129731. The reversal of 242129681 is 186921242.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 226201600 + 15928081 = 15040^2 + 3991^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-242129681 is a prime.

It is a super-2 number, since 2×242129681² = 117253564842323522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (242129081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121064840 + 121064841.

It is an arithmetic number, because the mean of its divisors is an integer number (121064841).

Almost surely, 2^242129681 is an apocalyptic number.

It is an amenable number.

242129681 is a deficient number, since it is larger than the sum of its proper divisors (1).

242129681 is an equidigital number, since it uses as much as digits as its factorization.

242129681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13824, while the sum is 35.

The square root of 242129681 is about 15560.5167330651. The cubic root of 242129681 is about 623.2792612944.

The spelling of 242129681 in words is "two hundred forty-two million, one hundred twenty-nine thousand, six hundred eighty-one".