1218334913 has 2 divisors, whose sum is σ = 1218334914. Its totient is φ = 1218334912.

The previous prime is 1218334879. The next prime is 1218334933. The reversal of 1218334913 is 3194338121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 939545104 + 278789809 = 30652^2 + 16697^2 .

It is a cyclic number.

It is not a de Polignac number, because 1218334913 - 2⁸ = 1218334657 is a prime.

It is not a weakly prime, because it can be changed into another prime (1218334933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 609167456 + 609167457.

It is an arithmetic number, because the mean of its divisors is an integer number (609167457).

Almost surely, 2^1218334913 is an apocalyptic number.

It is an amenable number.

1218334913 is a deficient number, since it is larger than the sum of its proper divisors (1).

1218334913 is an equidigital number, since it uses as much as digits as its factorization.

1218334913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 35.

The square root of 1218334913 is about 34904.6546036485. The cubic root of 1218334913 is about 1068.0433899830.

The spelling of 1218334913 in words is "one billion, two hundred eighteen million, three hundred thirty-four thousand, nine hundred thirteen".