2118692789 has 2 divisors, whose sum is σ = 2118692790. Its totient is φ = 2118692788.

The previous prime is 2118692783. The next prime is 2118692879. The reversal of 2118692789 is 9872968112.

Together with next prime (2118692879) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1369740100 + 748952689 = 37010^2 + 27367^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2118692789 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2118692789.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2118692783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1059346394 + 1059346395.

It is an arithmetic number, because the mean of its divisors is an integer number (1059346395).

Almost surely, 2^2118692789 is an apocalyptic number.

It is an amenable number.

2118692789 is a deficient number, since it is larger than the sum of its proper divisors (1).

2118692789 is an equidigital number, since it uses as much as digits as its factorization.

2118692789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 870912, while the sum is 53.

The square root of 2118692789 is about 46029.2601396112. The cubic root of 2118692789 is about 1284.3675649599.

The spelling of 2118692789 in words is "two billion, one hundred eighteen million, six hundred ninety-two thousand, seven hundred eighty-nine".