218004893 has 2 divisors, whose sum is σ = 218004894. Its totient is φ = 218004892.

The previous prime is 218004859. The next prime is 218004931. The reversal of 218004893 is 398400812.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 183277444 + 34727449 = 13538^2 + 5893^2 .

It is a cyclic number.

It is not a de Polignac number, because 218004893 - 2²⁰ = 216956317 is a prime.

It is a super-2 number, since 2×218004893² = 95052266743882898, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (218001893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109002446 + 109002447.

It is an arithmetic number, because the mean of its divisors is an integer number (109002447).

Almost surely, 2^218004893 is an apocalyptic number.

It is an amenable number.

218004893 is a deficient number, since it is larger than the sum of its proper divisors (1).

218004893 is an equidigital number, since it uses as much as digits as its factorization.

218004893 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 218004893 is about 14764.9887571918. The cubic root of 218004893 is about 601.8506682501.

The spelling of 218004893 in words is "two hundred eighteen million, four thousand, eight hundred ninety-three".