1218864211 has 4 divisors (see below), whose sum is σ = 1219086000. Its totient is φ = 1218642424.

The previous prime is 1218864191. The next prime is 1218864223. The reversal of 1218864211 is 1124688121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1218864211 - 2¹¹ = 1218862163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1218864271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102436 + ... + 113713.

It is an arithmetic number, because the mean of its divisors is an integer number (304771500).

Almost surely, 2^1218864211 is an apocalyptic number.

1218864211 is a deficient number, since it is larger than the sum of its proper divisors (221789).

1218864211 is an equidigital number, since it uses as much as digits as its factorization.

1218864211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221788.

The product of its digits is 6144, while the sum is 34.

The square root of 1218864211 is about 34912.2358350192. The cubic root of 1218864211 is about 1068.1980358520.

The spelling of 1218864211 in words is "one billion, two hundred eighteen million, eight hundred sixty-four thousand, two hundred eleven".