211445109 has 6 divisors (see below), whose sum is σ = 305420726. Its totient is φ = 140963400.

The previous prime is 211445083. The next prime is 211445111. The reversal of 211445109 is 901544112.

211445109 is a `hidden beast` number, since 2 + 1 + 144 + 510 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 202977009 + 8468100 = 14247^2 + 2910^2 .

It is not a de Polignac number, because 211445109 - 2⁸ = 211444853 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211445909) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11746942 + ... + 11746959.

Almost surely, 2^211445109 is an apocalyptic number.

It is an amenable number.

211445109 is a deficient number, since it is larger than the sum of its proper divisors (93975617).

211445109 is a wasteful number, since it uses less digits than its factorization.

211445109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23493907 (or 23493904 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 211445109 is about 14541.1522583322. The cubic root of 211445109 is about 595.7525106775.

The spelling of 211445109 in words is "two hundred eleven million, four hundred forty-five thousand, one hundred nine".