242042509 has 2 divisors, whose sum is σ = 242042510. Its totient is φ = 242042508.

The previous prime is 242042477. The next prime is 242042551. The reversal of 242042509 is 905240242.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 213452100 + 28590409 = 14610^2 + 5347^2 .

It is a cyclic number.

It is not a de Polignac number, because 242042509 - 2⁵ = 242042477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (242042579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121021254 + 121021255.

It is an arithmetic number, because the mean of its divisors is an integer number (121021255).

Almost surely, 2^242042509 is an apocalyptic number.

It is an amenable number.

242042509 is a deficient number, since it is larger than the sum of its proper divisors (1).

242042509 is an equidigital number, since it uses as much as digits as its factorization.

242042509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 242042509 is about 15557.7154171170. The cubic root of 242042509 is about 623.2044542445.

The spelling of 242042509 in words is "two hundred forty-two million, forty-two thousand, five hundred nine".