2188734689 has 2 divisors, whose sum is σ = 2188734690. Its totient is φ = 2188734688.

The previous prime is 2188734673. The next prime is 2188734707. The reversal of 2188734689 is 9864378812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1957177600 + 231557089 = 44240^2 + 15217^2 .

It is a cyclic number.

It is not a de Polignac number, because 2188734689 - 2⁴ = 2188734673 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (2188734389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1094367344 + 1094367345.

It is an arithmetic number, because the mean of its divisors is an integer number (1094367345).

Almost surely, 2^2188734689 is an apocalyptic number.

It is an amenable number.

2188734689 is a deficient number, since it is larger than the sum of its proper divisors (1).

2188734689 is an equidigital number, since it uses as much as digits as its factorization.

2188734689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4644864, while the sum is 56.

The square root of 2188734689 is about 46783.9148532912. The cubic root of 2188734689 is about 1298.3677124922.

The spelling of 2188734689 in words is "two billion, one hundred eighty-eight million, seven hundred thirty-four thousand, six hundred eighty-nine".