242987016809 has 2 divisors, whose sum is σ = 242987016810. Its totient is φ = 242987016808.

The previous prime is 242987016781. The next prime is 242987016871. The reversal of 242987016809 is 908610789242.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 215136413584 + 27850603225 = 463828^2 + 166885^2 .

It is a cyclic number.

It is not a de Polignac number, because 242987016809 - 2³² = 238692049513 is a prime.

It is not a weakly prime, because it can be changed into another prime (242987019809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121493508404 + 121493508405.

It is an arithmetic number, because the mean of its divisors is an integer number (121493508405).

Almost surely, 2^242987016809 is an apocalyptic number.

It is an amenable number.

242987016809 is a deficient number, since it is larger than the sum of its proper divisors (1).

242987016809 is an equidigital number, since it uses as much as digits as its factorization.

242987016809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3483648, while the sum is 56.

The spelling of 242987016809 in words is "two hundred forty-two billion, nine hundred eighty-seven million, sixteen thousand, eight hundred nine".