2117090917 has 2 divisors, whose sum is σ = 2117090918. Its totient is φ = 2117090916.

The previous prime is 2117090909. The next prime is 2117090951. The reversal of 2117090917 is 7190907112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1086295681 + 1030795236 = 32959^2 + 32106^2 .

It is a cyclic number.

It is not a de Polignac number, because 2117090917 - 2³ = 2117090909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2117090117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1058545458 + 1058545459.

It is an arithmetic number, because the mean of its divisors is an integer number (1058545459).

Almost surely, 2^2117090917 is an apocalyptic number.

It is an amenable number.

2117090917 is a deficient number, since it is larger than the sum of its proper divisors (1).

2117090917 is an equidigital number, since it uses as much as digits as its factorization.

2117090917 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7938, while the sum is 37.

The square root of 2117090917 is about 46011.8562655323. The cubic root of 2117090917 is about 1284.0437943820.

The spelling of 2117090917 in words is "two billion, one hundred seventeen million, ninety thousand, nine hundred seventeen".