211261345289 has 2 divisors, whose sum is σ = 211261345290. Its totient is φ = 211261345288.

The previous prime is 211261345259. The next prime is 211261345301. The reversal of 211261345289 is 982543162112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 136367718400 + 74893626889 = 369280^2 + 273667^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211261345289 is a prime.

It is not a weakly prime, because it can be changed into another prime (211261345259) 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, 105630672644 + 105630672645.

It is an arithmetic number, because the mean of its divisors is an integer number (105630672645).

Almost surely, 2^211261345289 is an apocalyptic number.

It is an amenable number.

211261345289 is a deficient number, since it is larger than the sum of its proper divisors (1).

211261345289 is an equidigital number, since it uses as much as digits as its factorization.

211261345289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 207360, while the sum is 44.

The spelling of 211261345289 in words is "two hundred eleven billion, two hundred sixty-one million, three hundred forty-five thousand, two hundred eighty-nine".