218750117 has 2 divisors, whose sum is σ = 218750118. Its totient is φ = 218750116.

The previous prime is 218750113. The next prime is 218750149. The reversal of 218750117 is 711057812.

218750117 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (218750149) can be obtained adding 218750117 to its sum of digits (32).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 215238241 + 3511876 = 14671^2 + 1874^2 .

It is a cyclic number.

It is not a de Polignac number, because 218750117 - 2² = 218750113 is a prime.

It is a super-2 number, since 2×218750117² = 95703227375027378, which contains 22 as substring.

It is a Chen prime.

It is equal to p_12057476 and since 218750117 and 12057476 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (218750113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109375058 + 109375059.

It is an arithmetic number, because the mean of its divisors is an integer number (109375059).

Almost surely, 2^218750117 is an apocalyptic number.

It is an amenable number.

218750117 is a deficient number, since it is larger than the sum of its proper divisors (1).

218750117 is an equidigital number, since it uses as much as digits as its factorization.

218750117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3920, while the sum is 32.

The square root of 218750117 is about 14790.2034130704. The cubic root of 218750117 is about 602.5356734673.

The spelling of 218750117 in words is "two hundred eighteen million, seven hundred fifty thousand, one hundred seventeen".