1218818317 has 2 divisors, whose sum is σ = 1218818318. Its totient is φ = 1218818316.

The previous prime is 1218818311. The next prime is 1218818407. The reversal of 1218818317 is 7138188121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1085438916 + 133379401 = 32946^2 + 11549^2 .

It is a cyclic number.

It is not a de Polignac number, because 1218818317 - 2⁷ = 1218818189 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1218818317.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1218818311) 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 as a sum of consecutive naturals, namely, 609409158 + 609409159.

It is an arithmetic number, because the mean of its divisors is an integer number (609409159).

Almost surely, 2^1218818317 is an apocalyptic number.

It is an amenable number.

1218818317 is a deficient number, since it is larger than the sum of its proper divisors (1).

1218818317 is an equidigital number, since it uses as much as digits as its factorization.

1218818317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21504, while the sum is 40.

The square root of 1218818317 is about 34911.5785521079. The cubic root of 1218818317 is about 1068.1846286993.

The spelling of 1218818317 in words is "one billion, two hundred eighteen million, eight hundred eighteen thousand, three hundred seventeen".