211988549 has 2 divisors, whose sum is σ = 211988550. Its totient is φ = 211988548.

The previous prime is 211988519. The next prime is 211988551. The reversal of 211988549 is 945889112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 196504324 + 15484225 = 14018^2 + 3935^2 .

It is a cyclic number.

It is not a de Polignac number, because 211988549 - 2²⁴ = 195211333 is a prime.

Together with 211988551, 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 (211988519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105994274 + 105994275.

It is an arithmetic number, because the mean of its divisors is an integer number (105994275).

Almost surely, 2^211988549 is an apocalyptic number.

It is an amenable number.

211988549 is a deficient number, since it is larger than the sum of its proper divisors (1).

211988549 is an equidigital number, since it uses as much as digits as its factorization.

211988549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 207360, while the sum is 47.

The square root of 211988549 is about 14559.8265442965. The cubic root of 211988549 is about 596.2624598509.

The spelling of 211988549 in words is "two hundred eleven million, nine hundred eighty-eight thousand, five hundred forty-nine".