242520139 has 2 divisors, whose sum is σ = 242520140. Its totient is φ = 242520138.

The previous prime is 242520137. The next prime is 242520203. The reversal of 242520139 is 931025242.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 242520139 - 2¹ = 242520137 is a prime.

Together with 242520137, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (242520137) 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, 121260069 + 121260070.

It is an arithmetic number, because the mean of its divisors is an integer number (121260070).

Almost surely, 2^242520139 is an apocalyptic number.

242520139 is a deficient number, since it is larger than the sum of its proper divisors (1).

242520139 is an equidigital number, since it uses as much as digits as its factorization.

242520139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 242520139 is about 15573.0581132930. The cubic root of 242520139 is about 623.6141144655.

The spelling of 242520139 in words is "two hundred forty-two million, five hundred twenty thousand, one hundred thirty-nine".