242142139 has 2 divisors, whose sum is σ = 242142140. Its totient is φ = 242142138.

The previous prime is 242142113. The next prime is 242142161. The reversal of 242142139 is 931241242.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 242142139 - 2¹¹ = 242140091 is a prime.

It is not a weakly prime, because it can be changed into another prime (242142179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121071069 + 121071070.

It is an arithmetic number, because the mean of its divisors is an integer number (121071070).

Almost surely, 2^242142139 is an apocalyptic number.

242142139 is a deficient number, since it is larger than the sum of its proper divisors (1).

242142139 is an equidigital number, since it uses as much as digits as its factorization.

242142139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 28.

The square root of 242142139 is about 15560.9170359590. The cubic root of 242142139 is about 623.2899507175.

The spelling of 242142139 in words is "two hundred forty-two million, one hundred forty-two thousand, one hundred thirty-nine".