242681 has 2 divisors, whose sum is σ = 242682. Its totient is φ = 242680.

The previous prime is 242677. The next prime is 242689. The reversal of 242681 is 186242.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 241081 + 1600 = 491^2 + 40^2 .

It is a cyclic number.

It is not a de Polignac number, because 242681 - 2² = 242677 is a prime.

It is a super-2 number, since 2×242681² = 117788135522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (242689) 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, 121340 + 121341.

It is an arithmetic number, because the mean of its divisors is an integer number (121341).

2²⁴²⁶⁸¹ is an apocalyptic number.

It is an amenable number.

242681 is a deficient number, since it is larger than the sum of its proper divisors (1).

242681 is an equidigital number, since it uses as much as digits as its factorization.

242681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 768, while the sum is 23.

The square root of 242681 is about 492.6266334660. The cubic root of 242681 is about 62.3751962837.

The spelling of 242681 in words is "two hundred forty-two thousand, six hundred eighty-one".