218947 has 2 divisors, whose sum is σ = 218948. Its totient is φ = 218946.

The previous prime is 218941. The next prime is 218963. The reversal of 218947 is 749812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 218947 - 2⁷ = 218819 is a 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 (218941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109473 + 109474.

It is an arithmetic number, because the mean of its divisors is an integer number (109474).

2²¹⁸⁹⁴⁷ is an apocalyptic number.

218947 is a deficient number, since it is larger than the sum of its proper divisors (1).

218947 is an equidigital number, since it uses as much as digits as its factorization.

218947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4032, while the sum is 31.

The square root of 218947 is about 467.9177278112. The cubic root of 218947 is about 60.2716387212.

The spelling of 218947 in words is "two hundred eighteen thousand, nine hundred forty-seven".