211897 has 4 divisors (see below), whose sum is σ = 242176. Its totient is φ = 181620.

The previous prime is 211891. The next prime is 211927. The reversal of 211897 is 798112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 211897 - 2³ = 211889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211891) 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, 15129 + ... + 15142.

It is an arithmetic number, because the mean of its divisors is an integer number (60544).

2²¹¹⁸⁹⁷ is an apocalyptic number.

It is an amenable number.

211897 is a deficient number, since it is larger than the sum of its proper divisors (30279).

211897 is an equidigital number, since it uses as much as digits as its factorization.

211897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30278.

The product of its digits is 1008, while the sum is 28.

The square root of 211897 is about 460.3227128874. The cubic root of 211897 is about 59.6176613875.

The spelling of 211897 in words is "two hundred eleven thousand, eight hundred ninety-seven".