2118689 has 2 divisors, whose sum is σ = 2118690. Its totient is φ = 2118688.

The previous prime is 2118667. The next prime is 2118703. The reversal of 2118689 is 9868112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1868689 + 250000 = 1367^2 + 500^2 .

It is a cyclic number.

It is not a de Polignac number, because 2118689 - 2⁸ = 2118433 is a prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (2118629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1059344 + 1059345.

It is an arithmetic number, because the mean of its divisors is an integer number (1059345).

2^2118689 is an apocalyptic number.

It is an amenable number.

2118689 is a deficient number, since it is larger than the sum of its proper divisors (1).

2118689 is an equidigital number, since it uses as much as digits as its factorization.

2118689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 35.

The square root of 2118689 is about 1455.5717089859. The cubic root of 2118689 is about 128.4366799319.

The spelling of 2118689 in words is "two million, one hundred eighteen thousand, six hundred eighty-nine".