242108981 has 2 divisors, whose sum is σ = 242108982. Its totient is φ = 242108980.

The previous prime is 242108969. The next prime is 242108983. The reversal of 242108981 is 189801242.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 238208356 + 3900625 = 15434^2 + 1975^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-242108981 is a prime.

It is a super-2 number, since 2×242108981² = 117233517361716722, which contains 22 as substring.

Together with 242108983, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (242108983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121054490 + 121054491.

It is an arithmetic number, because the mean of its divisors is an integer number (121054491).

Almost surely, 2^242108981 is an apocalyptic number.

It is an amenable number.

242108981 is a deficient number, since it is larger than the sum of its proper divisors (1).

242108981 is an equidigital number, since it uses as much as digits as its factorization.

242108981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9216, while the sum is 35.

The square root of 242108981 is about 15559.8515738422. The cubic root of 242108981 is about 623.2614991206.

The spelling of 242108981 in words is "two hundred forty-two million, one hundred eight thousand, nine hundred eighty-one".