218430887 has 2 divisors, whose sum is σ = 218430888. Its totient is φ = 218430886.

The previous prime is 218430881. The next prime is 218430889. The reversal of 218430887 is 788034812.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 218430887 - 2¹⁶ = 218365351 is a prime.

Together with 218430889, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (218430881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109215443 + 109215444.

It is an arithmetic number, because the mean of its divisors is an integer number (109215444).

Almost surely, 2^218430887 is an apocalyptic number.

218430887 is a deficient number, since it is larger than the sum of its proper divisors (1).

218430887 is an equidigital number, since it uses as much as digits as its factorization.

218430887 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 86016, while the sum is 41.

The square root of 218430887 is about 14779.4075321036. The cubic root of 218430887 is about 602.2424300347.

The spelling of 218430887 in words is "two hundred eighteen million, four hundred thirty thousand, eight hundred eighty-seven".