1218043213 has 2 divisors, whose sum is σ = 1218043214. Its totient is φ = 1218043212.

The previous prime is 1218043207. The next prime is 1218043237. The reversal of 1218043213 is 3123408121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1189077289 + 28965924 = 34483^2 + 5382^2 .

It is an emirp because it is prime and its reverse (3123408121) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1218043213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1218043283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 609021606 + 609021607.

It is an arithmetic number, because the mean of its divisors is an integer number (609021607).

Almost surely, 2^1218043213 is an apocalyptic number.

It is an amenable number.

1218043213 is a deficient number, since it is larger than the sum of its proper divisors (1).

1218043213 is an equidigital number, since it uses as much as digits as its factorization.

1218043213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 1218043213 is about 34900.4758277018. The cubic root of 1218043213 is about 1067.9581443686.

The spelling of 1218043213 in words is "one billion, two hundred eighteen million, forty-three thousand, two hundred thirteen".