242665987 has 2 divisors, whose sum is σ = 242665988. Its totient is φ = 242665986.

The previous prime is 242665957. The next prime is 242666023. The reversal of 242665987 is 789566242.

242665987 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 is a cyclic number.

It is not a de Polignac number, because 242665987 - 2²⁷ = 108448259 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 242665987.

It is not a weakly prime, because it can be changed into another prime (242665957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121332993 + 121332994.

It is an arithmetic number, because the mean of its divisors is an integer number (121332994).

Almost surely, 2^242665987 is an apocalyptic number.

242665987 is a deficient number, since it is larger than the sum of its proper divisors (1).

242665987 is an equidigital number, since it uses as much as digits as its factorization.

242665987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1451520, while the sum is 49.

The square root of 242665987 is about 15577.7401120958. The cubic root of 242665987 is about 623.7391001612.

The spelling of 242665987 in words is "two hundred forty-two million, six hundred sixty-five thousand, nine hundred eighty-seven".