218363 has 2 divisors, whose sum is σ = 218364. Its totient is φ = 218362.

The previous prime is 218357. The next prime is 218371. The reversal of 218363 is 363812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 218363 - 2⁸ = 218107 is a prime.

It is a super-4 number, since 4×218363⁴ (a number of 22 digits) contains 4444 as substring.

It is a Sophie Germain prime.

It is an alternating number because its digits alternate between even and odd.

It is not a weakly prime, because it can be changed into another prime (218963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109181 + 109182.

It is an arithmetic number, because the mean of its divisors is an integer number (109182).

2²¹⁸³⁶³ is an apocalyptic number.

218363 is a deficient number, since it is larger than the sum of its proper divisors (1).

218363 is an equidigital number, since it uses as much as digits as its factorization.

218363 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 23.

The square root of 218363 is about 467.2932697996. The cubic root of 218363 is about 60.2180032467.

The spelling of 218363 in words is "two hundred eighteen thousand, three hundred sixty-three".