218873869 has 2 divisors, whose sum is σ = 218873870. Its totient is φ = 218873868.

The previous prime is 218873821. The next prime is 218873923. The reversal of 218873869 is 968378812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 131675625 + 87198244 = 11475^2 + 9338^2 .

It is a cyclic number.

It is not a de Polignac number, because 218873869 - 2¹⁵ = 218841101 is a prime.

It is a super-2 number, since 2×218873869² = 95811541062058322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (218873069) 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, 109436934 + 109436935.

It is an arithmetic number, because the mean of its divisors is an integer number (109436935).

Almost surely, 2^218873869 is an apocalyptic number.

It is an amenable number.

218873869 is a deficient number, since it is larger than the sum of its proper divisors (1).

218873869 is an equidigital number, since it uses as much as digits as its factorization.

218873869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1161216, while the sum is 52.

The square root of 218873869 is about 14794.3864016052. The cubic root of 218873869 is about 602.6492748359.

The spelling of 218873869 in words is "two hundred eighteen million, eight hundred seventy-three thousand, eight hundred sixty-nine".