2188128317 has 2 divisors, whose sum is σ = 2188128318. Its totient is φ = 2188128316.

The previous prime is 2188128289. The next prime is 2188128347. The reversal of 2188128317 is 7138218812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1418953561 + 769174756 = 37669^2 + 27734^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2188128317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2188128347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1094064158 + 1094064159.

It is an arithmetic number, because the mean of its divisors is an integer number (1094064159).

Almost surely, 2^2188128317 is an apocalyptic number.

It is an amenable number.

2188128317 is a deficient number, since it is larger than the sum of its proper divisors (1).

2188128317 is an equidigital number, since it uses as much as digits as its factorization.

2188128317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43008, while the sum is 41.

The square root of 2188128317 is about 46777.4338436815. The cubic root of 2188128317 is about 1298.2478005104.

The spelling of 2188128317 in words is "two billion, one hundred eighty-eight million, one hundred twenty-eight thousand, three hundred seventeen".