211099949 has 2 divisors, whose sum is σ = 211099950. Its totient is φ = 211099948.

The previous prime is 211099919. The next prime is 211100009. The reversal of 211099949 is 949990112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 202863049 + 8236900 = 14243^2 + 2870^2 .

It is a cyclic number.

It is not a de Polignac number, because 211099949 - 2¹² = 211095853 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 (211099909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105549974 + 105549975.

It is an arithmetic number, because the mean of its divisors is an integer number (105549975).

Almost surely, 2^211099949 is an apocalyptic number.

It is an amenable number.

211099949 is a deficient number, since it is larger than the sum of its proper divisors (1).

211099949 is an equidigital number, since it uses as much as digits as its factorization.

211099949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52488, while the sum is 44.

The square root of 211099949 is about 14529.2790254713. The cubic root of 211099949 is about 595.4281681436.

The spelling of 211099949 in words is "two hundred eleven million, ninety-nine thousand, nine hundred forty-nine".