211289 has 4 divisors (see below), whose sum is σ = 227556. Its totient is φ = 195024.

The previous prime is 211283. The next prime is 211291. The reversal of 211289 is 982112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 85264 + 126025 = 292^2 + 355^2 .

It is a cyclic number.

It is not a de Polignac number, because 211289 - 2¹⁶ = 145753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211283) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8114 + ... + 8139.

It is an arithmetic number, because the mean of its divisors is an integer number (56889).

2²¹¹²⁸⁹ is an apocalyptic number.

It is an amenable number.

211289 is a deficient number, since it is larger than the sum of its proper divisors (16267).

211289 is a wasteful number, since it uses less digits than its factorization.

211289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16266.

The product of its digits is 288, while the sum is 23.

The square root of 211289 is about 459.6618322202. The cubic root of 211289 is about 59.5605860756.

It can be divided in two parts, 2 and 11289, that multiplied together give a triangular number (22578 = T₂₁₂).

The spelling of 211289 in words is "two hundred eleven thousand, two hundred eighty-nine".