211231289 has 2 divisors, whose sum is σ = 211231290. Its totient is φ = 211231288.

The previous prime is 211231271. The next prime is 211231297. The reversal of 211231289 is 982132112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 182790400 + 28440889 = 13520^2 + 5333^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211231289 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (211231219) 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, 105615644 + 105615645.

It is an arithmetic number, because the mean of its divisors is an integer number (105615645).

Almost surely, 2^211231289 is an apocalyptic number.

It is an amenable number.

211231289 is a deficient number, since it is larger than the sum of its proper divisors (1).

211231289 is an equidigital number, since it uses as much as digits as its factorization.

211231289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 29.

The square root of 211231289 is about 14533.7981615268. The cubic root of 211231289 is about 595.5516283386.

The spelling of 211231289 in words is "two hundred eleven million, two hundred thirty-one thousand, two hundred eighty-nine".