2118917 has 2 divisors, whose sum is σ = 2118918. Its totient is φ = 2118916.

The previous prime is 2118889. The next prime is 2118923. The reversal of 2118917 is 7198112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2076481 + 42436 = 1441^2 + 206^2 .

It is a cyclic number.

It is not a de Polignac number, because 2118917 - 2⁸ = 2118661 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2118917.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2118517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1059458 + 1059459.

It is an arithmetic number, because the mean of its divisors is an integer number (1059459).

2^2118917 is an apocalyptic number.

It is an amenable number.

2118917 is a deficient number, since it is larger than the sum of its proper divisors (1).

2118917 is an equidigital number, since it uses as much as digits as its factorization.

2118917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1008, while the sum is 29.

The square root of 2118917 is about 1455.6500266204. The cubic root of 2118917 is about 128.4412869496.

The spelling of 2118917 in words is "two million, one hundred eighteen thousand, nine hundred seventeen".