211065839 has 2 divisors, whose sum is σ = 211065840. Its totient is φ = 211065838.

The previous prime is 211065781. The next prime is 211065847. The reversal of 211065839 is 938560112.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211065839 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 211065799 and 211065808.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211065139) 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, 105532919 + 105532920.

It is an arithmetic number, because the mean of its divisors is an integer number (105532920).

Almost surely, 2^211065839 is an apocalyptic number.

211065839 is a deficient number, since it is larger than the sum of its proper divisors (1).

211065839 is an equidigital number, since it uses as much as digits as its factorization.

211065839 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 211065839 is about 14528.1051414147. The cubic root of 211065839 is about 595.3960962128.

The spelling of 211065839 in words is "two hundred eleven million, sixty-five thousand, eight hundred thirty-nine".