2116581109 has 2 divisors, whose sum is σ = 2116581110. Its totient is φ = 2116581108.

The previous prime is 2116581101. The next prime is 2116581139. The reversal of 2116581109 is 9011856112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1652178609 + 464402500 = 40647^2 + 21550^2 .

It is a cyclic number.

It is not a de Polignac number, because 2116581109 - 2³ = 2116581101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2116581101) 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, 1058290554 + 1058290555.

It is an arithmetic number, because the mean of its divisors is an integer number (1058290555).

Almost surely, 2^2116581109 is an apocalyptic number.

It is an amenable number.

2116581109 is a deficient number, since it is larger than the sum of its proper divisors (1).

2116581109 is an equidigital number, since it uses as much as digits as its factorization.

2116581109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 34.

The square root of 2116581109 is about 46006.3159685711. The cubic root of 2116581109 is about 1283.9407176639.

The spelling of 2116581109 in words is "two billion, one hundred sixteen million, five hundred eighty-one thousand, one hundred nine".