218219969 has 24 divisors (see below), whose sum is σ = 251098848. Its totient is φ = 187971840.

The previous prime is 218219933. The next prime is 218219971. The reversal of 218219969 is 969912812.

It is not a de Polignac number, because 218219969 - 2⁸ = 218219713 is a prime.

It is a super-2 number, since 2×218219969² = 95239909740721922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (218219069) 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 in 23 ways as a sum of consecutive naturals, for example, 647369 + ... + 647705.

It is an arithmetic number, because the mean of its divisors is an integer number (10462452).

Almost surely, 2^218219969 is an apocalyptic number.

It is an amenable number.

218219969 is a deficient number, since it is larger than the sum of its proper divisors (32878879).

218219969 is a wasteful number, since it uses less digits than its factorization.

218219969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 465 (or 428 counting only the distinct ones).

The product of its digits is 139968, while the sum is 47.

The square root of 218219969 is about 14772.2702723718. The cubic root of 218219969 is about 602.0485248023.

The spelling of 218219969 in words is "two hundred eighteen million, two hundred nineteen thousand, nine hundred sixty-nine".