242991239 has 2 divisors, whose sum is σ = 242991240. Its totient is φ = 242991238.

The previous prime is 242991227. The next prime is 242991257. The reversal of 242991239 is 932199242.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-242991239 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 242991196 and 242991205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (242991289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121495619 + 121495620.

It is an arithmetic number, because the mean of its divisors is an integer number (121495620).

Almost surely, 2^242991239 is an apocalyptic number.

242991239 is a deficient number, since it is larger than the sum of its proper divisors (1).

242991239 is an equidigital number, since it uses as much as digits as its factorization.

242991239 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69984, while the sum is 41.

The square root of 242991239 is about 15588.1762563810. The cubic root of 242991239 is about 624.0176473957.

The spelling of 242991239 in words is "two hundred forty-two million, nine hundred ninety-one thousand, two hundred thirty-nine".