211979189 has 2 divisors, whose sum is σ = 211979190. Its totient is φ = 211979188.

The previous prime is 211979123. The next prime is 211979191. The reversal of 211979189 is 981979112.

211979189 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 169859089 + 42120100 = 13033^2 + 6490^2 .

It is a cyclic number.

It is not a de Polignac number, because 211979189 - 2²⁰ = 210930613 is a prime.

Together with 211979191, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211973189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105989594 + 105989595.

It is an arithmetic number, because the mean of its divisors is an integer number (105989595).

Almost surely, 2^211979189 is an apocalyptic number.

It is an amenable number.

211979189 is a deficient number, since it is larger than the sum of its proper divisors (1).

211979189 is an equidigital number, since it uses as much as digits as its factorization.

211979189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 47.

The square root of 211979189 is about 14559.5051083476. The cubic root of 211979189 is about 596.2536840644.

The spelling of 211979189 in words is "two hundred eleven million, nine hundred seventy-nine thousand, one hundred eighty-nine".