1818291217 has 2 divisors, whose sum is σ = 1818291218. Its totient is φ = 1818291216.

The previous prime is 1818291199. The next prime is 1818291221. The reversal of 1818291217 is 7121928181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1746905616 + 71385601 = 41796^2 + 8449^2 .

It is a cyclic number.

It is not a de Polignac number, because 1818291217 - 2¹¹ = 1818289169 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1818291217.

It is not a weakly prime, because it can be changed into another prime (1818291817) 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, 909145608 + 909145609.

It is an arithmetic number, because the mean of its divisors is an integer number (909145609).

Almost surely, 2^1818291217 is an apocalyptic number.

It is an amenable number.

1818291217 is a deficient number, since it is larger than the sum of its proper divisors (1).

1818291217 is an equidigital number, since it uses as much as digits as its factorization.

1818291217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128, while the sum is 40.

The square root of 1818291217 is about 42641.4260666784. The cubic root of 1818291217 is about 1220.5469233267.

The spelling of 1818291217 in words is "one billion, eight hundred eighteen million, two hundred ninety-one thousand, two hundred seventeen".