2106856859 has 2 divisors, whose sum is σ = 2106856860. Its totient is φ = 2106856858.

The previous prime is 2106856847. The next prime is 2106856877. The reversal of 2106856859 is 9586586012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2106856859 - 2²⁰ = 2105808283 is a prime.

It is a super-3 number, since 3×2106856859³ (a number of 29 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (2106856889) 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, 1053428429 + 1053428430.

It is an arithmetic number, because the mean of its divisors is an integer number (1053428430).

Almost surely, 2^2106856859 is an apocalyptic number.

2106856859 is a deficient number, since it is larger than the sum of its proper divisors (1).

2106856859 is an equidigital number, since it uses as much as digits as its factorization.

2106856859 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1036800, while the sum is 50.

The square root of 2106856859 is about 45900.5104437848. The cubic root of 2106856859 is about 1281.9714207315.

The spelling of 2106856859 in words is "two billion, one hundred six million, eight hundred fifty-six thousand, eight hundred fifty-nine".