211091 has 6 divisors (see below), whose sum is σ = 219492. Its totient is φ = 203000.

The previous prime is 211073. The next prime is 211093. The reversal of 211091 is 190112.

211091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 211091 - 2¹⁴ = 194707 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (211093) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 716 + ... + 966.

It is an arithmetic number, because the mean of its divisors is an integer number (36582).

2²¹¹⁰⁹¹ is an apocalyptic number.

211091 is a deficient number, since it is larger than the sum of its proper divisors (8401).

211091 is an equidigital number, since it uses as much as digits as its factorization.

211091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309 (or 280 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 14.

The square root of 211091 is about 459.4464060149. The cubic root of 211091 is about 59.5419754180.

The spelling of 211091 in words is "two hundred eleven thousand, ninety-one".