211945 has 16 divisors (see below), whose sum is σ = 282240. Its totient is φ = 152064.

The previous prime is 211943. The next prime is 211949. The reversal of 211945 is 549112.

It is a cyclic number.

It is not a de Polignac number, because 211945 - 2¹ = 211943 is a prime.

It is not an unprimeable number, because it can be changed into a prime (211943) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2137 + ... + 2233.

It is an arithmetic number, because the mean of its divisors is an integer number (17640).

2²¹¹⁹⁴⁵ is an apocalyptic number.

It is an amenable number.

211945 is a deficient number, since it is larger than the sum of its proper divisors (70295).

211945 is a wasteful number, since it uses less digits than its factorization.

211945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144.

The product of its digits is 360, while the sum is 22.

The square root of 211945 is about 460.3748472712. The cubic root of 211945 is about 59.6221626809.

It can be divided in two parts, 211 and 945, that added together give a square (1156 = 34²).

The spelling of 211945 in words is "two hundred eleven thousand, nine hundred forty-five".