2217817993 has 2 divisors, whose sum is σ = 2217817994. Its totient is φ = 2217817992.

The previous prime is 2217817969. The next prime is 2217818023. The reversal of 2217817993 is 3997187122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1740308089 + 477509904 = 41717^2 + 21852^2 .

It is a cyclic number.

It is not a de Polignac number, because 2217817993 - 2¹⁷ = 2217686921 is a prime.

It is not a weakly prime, because it can be changed into another prime (2217817963) 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, 1108908996 + 1108908997.

It is an arithmetic number, because the mean of its divisors is an integer number (1108908997).

Almost surely, 2^2217817993 is an apocalyptic number.

It is an amenable number.

2217817993 is a deficient number, since it is larger than the sum of its proper divisors (1).

2217817993 is an equidigital number, since it uses as much as digits as its factorization.

2217817993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 381024, while the sum is 49.

The square root of 2217817993 is about 47093.7150052956. The cubic root of 2217817993 is about 1304.0932115063.

The spelling of 2217817993 in words is "two billion, two hundred seventeen million, eight hundred seventeen thousand, nine hundred ninety-three".