218630873 has 2 divisors, whose sum is σ = 218630874. Its totient is φ = 218630872.

The previous prime is 218630843. The next prime is 218630899. The reversal of 218630873 is 378036812.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 137053849 + 81577024 = 11707^2 + 9032^2 .

It is a cyclic number.

It is not a de Polignac number, because 218630873 - 2⁶ = 218630809 is a prime.

It is not a weakly prime, because it can be changed into another prime (218630803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109315436 + 109315437.

It is an arithmetic number, because the mean of its divisors is an integer number (109315437).

Almost surely, 2^218630873 is an apocalyptic number.

It is an amenable number.

218630873 is a deficient number, since it is larger than the sum of its proper divisors (1).

218630873 is an equidigital number, since it uses as much as digits as its factorization.

218630873 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 218630873 is about 14786.1716816761. The cubic root of 218630873 is about 602.4261697954.

The spelling of 218630873 in words is "two hundred eighteen million, six hundred thirty thousand, eight hundred seventy-three".