242111291 has 2 divisors, whose sum is σ = 242111292. Its totient is φ = 242111290.

The previous prime is 242111171. The next prime is 242111293. The reversal of 242111291 is 192111242.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-242111291 is a prime.

Together with 242111293, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_13271018 and since 242111291 and 13271018 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (242111293) 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, 121055645 + 121055646.

It is an arithmetic number, because the mean of its divisors is an integer number (121055646).

Almost surely, 2^242111291 is an apocalyptic number.

242111291 is a deficient number, since it is larger than the sum of its proper divisors (1).

242111291 is an equidigital number, since it uses as much as digits as its factorization.

242111291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 288, while the sum is 23.

The square root of 242111291 is about 15559.9258031650. The cubic root of 242111291 is about 623.2634813264.

The spelling of 242111291 in words is "two hundred forty-two million, one hundred eleven thousand, two hundred ninety-one".