211518149 has 2 divisors, whose sum is σ = 211518150. Its totient is φ = 211518148.

The previous prime is 211518121. The next prime is 211518169. The reversal of 211518149 is 941815112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 190633249 + 20884900 = 13807^2 + 4570^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211518149 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211518169) 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, 105759074 + 105759075.

It is an arithmetic number, because the mean of its divisors is an integer number (105759075).

Almost surely, 2^211518149 is an apocalyptic number.

It is an amenable number.

211518149 is a deficient number, since it is larger than the sum of its proper divisors (1).

211518149 is an equidigital number, since it uses as much as digits as its factorization.

211518149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2880, while the sum is 32.

The square root of 211518149 is about 14543.6635343369. The cubic root of 211518149 is about 595.8211001949.

The spelling of 211518149 in words is "two hundred eleven million, five hundred eighteen thousand, one hundred forty-nine".