211291 has 2 divisors, whose sum is σ = 211292. Its totient is φ = 211290.

The previous prime is 211283. The next prime is 211297. The reversal of 211291 is 192112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 211291 - 2³ = 211283 is a prime.

211291 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (211297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105645 + 105646.

It is an arithmetic number, because the mean of its divisors is an integer number (105646).

2²¹¹²⁹¹ is an apocalyptic number.

211291 is a deficient number, since it is larger than the sum of its proper divisors (1).

211291 is an equidigital number, since it uses as much as digits as its factorization.

211291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36, while the sum is 16.

The square root of 211291 is about 459.6640077274. The cubic root of 211291 is about 59.5607740027.

The spelling of 211291 in words is "two hundred eleven thousand, two hundred ninety-one".