2106684709 has 2 divisors, whose sum is σ = 2106684710. Its totient is φ = 2106684708.

The previous prime is 2106684683. The next prime is 2106684721. The reversal of 2106684709 is 9074866012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2086479684 + 20205025 = 45678^2 + 4495^2 .

It is a cyclic number.

It is not a de Polignac number, because 2106684709 - 2⁹ = 2106684197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2106682709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1053342354 + 1053342355.

It is an arithmetic number, because the mean of its divisors is an integer number (1053342355).

Almost surely, 2^2106684709 is an apocalyptic number.

It is an amenable number.

2106684709 is a deficient number, since it is larger than the sum of its proper divisors (1).

2106684709 is an equidigital number, since it uses as much as digits as its factorization.

2106684709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 2106684709 is about 45898.6351539999. The cubic root of 2106684709 is about 1281.9365034105.

The spelling of 2106684709 in words is "two billion, one hundred six million, six hundred eighty-four thousand, seven hundred nine".