211949 has 2 divisors, whose sum is σ = 211950. Its totient is φ = 211948.

The previous prime is 211943. The next prime is 211969. The reversal of 211949 is 949112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 198025 + 13924 = 445^2 + 118^2 .

It is a cyclic number.

It is not a de Polignac number, because 211949 - 2⁴ = 211933 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105974 + 105975.

It is an arithmetic number, because the mean of its divisors is an integer number (105975).

2²¹¹⁹⁴⁹ is an apocalyptic number.

It is an amenable number.

211949 is a deficient number, since it is larger than the sum of its proper divisors (1).

211949 is an equidigital number, since it uses as much as digits as its factorization.

211949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 648, while the sum is 26.

The square root of 211949 is about 460.3791915367. The cubic root of 211949 is about 59.6225377580.

The spelling of 211949 in words is "two hundred eleven thousand, nine hundred forty-nine".