211085891 has 2 divisors, whose sum is σ = 211085892. Its totient is φ = 211085890.

The previous prime is 211085879. The next prime is 211085947. The reversal of 211085891 is 198580112.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211085891 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (211085491) 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, 105542945 + 105542946.

It is an arithmetic number, because the mean of its divisors is an integer number (105542946).

Almost surely, 2^211085891 is an apocalyptic number.

211085891 is a deficient number, since it is larger than the sum of its proper divisors (1).

211085891 is an equidigital number, since it uses as much as digits as its factorization.

211085891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 35.

The square root of 211085891 is about 14528.7952356691. The cubic root of 211085891 is about 595.4149505263.

The spelling of 211085891 in words is "two hundred eleven million, eighty-five thousand, eight hundred ninety-one".