242005891 has 2 divisors, whose sum is σ = 242005892. Its totient is φ = 242005890.

The previous prime is 242005889. The next prime is 242005909. The reversal of 242005891 is 198500242.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 242005891 - 2¹ = 242005889 is a prime.

Together with 242005889, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (242005391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121002945 + 121002946.

It is an arithmetic number, because the mean of its divisors is an integer number (121002946).

Almost surely, 2^242005891 is an apocalyptic number.

242005891 is a deficient number, since it is larger than the sum of its proper divisors (1).

242005891 is an equidigital number, since it uses as much as digits as its factorization.

242005891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 242005891 is about 15556.5385288630. The cubic root of 242005891 is about 623.1730249834.

The spelling of 242005891 in words is "two hundred forty-two million, five thousand, eight hundred ninety-one".