211749449 has 2 divisors, whose sum is σ = 211749450. Its totient is φ = 211749448.

The previous prime is 211749443. The next prime is 211749451. The reversal of 211749449 is 944947112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 200647225 + 11102224 = 14165^2 + 3332^2 .

It is a cyclic number.

It is not a de Polignac number, because 211749449 - 2²⁴ = 194972233 is a prime.

Together with 211749451, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (211749443) 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, 105874724 + 105874725.

It is an arithmetic number, because the mean of its divisors is an integer number (105874725).

Almost surely, 2^211749449 is an apocalyptic number.

It is an amenable number.

211749449 is a deficient number, since it is larger than the sum of its proper divisors (1).

211749449 is an equidigital number, since it uses as much as digits as its factorization.

211749449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 41.

The square root of 211749449 is about 14551.6132782589. The cubic root of 211749449 is about 596.0382024744.

The spelling of 211749449 in words is "two hundred eleven million, seven hundred forty-nine thousand, four hundred forty-nine".