242502809 has 2 divisors, whose sum is σ = 242502810. Its totient is φ = 242502808.

The previous prime is 242502797. The next prime is 242502857. The reversal of 242502809 is 908205242.

242502809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 242487184 + 15625 = 15572^2 + 125^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-242502809 is a prime.

It is a super-2 number, since 2×242502809² = 117615224745780962, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (242502889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121251404 + 121251405.

It is an arithmetic number, because the mean of its divisors is an integer number (121251405).

Almost surely, 2^242502809 is an apocalyptic number.

It is an amenable number.

242502809 is a deficient number, since it is larger than the sum of its proper divisors (1).

242502809 is an equidigital number, since it uses as much as digits as its factorization.

242502809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 242502809 is about 15572.5016936907. The cubic root of 242502809 is about 623.5992600427.

The spelling of 242502809 in words is "two hundred forty-two million, five hundred two thousand, eight hundred nine".