211664349 has 12 divisors (see below), whose sum is σ = 329255836. Its totient is φ = 130254912.

The previous prime is 211664347. The next prime is 211664357. The reversal of 211664349 is 943466112.

211664349 is a `hidden beast` number, since 2 + 1 + 1 + 6 + 643 + 4 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 130988025 + 80676324 = 11445^2 + 8982^2 .

It is not a de Polignac number, because 211664349 - 2¹ = 211664347 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211664347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 904432 + ... + 904665.

Almost surely, 2^211664349 is an apocalyptic number.

It is an amenable number.

211664349 is a deficient number, since it is larger than the sum of its proper divisors (117591487).

211664349 is a wasteful number, since it uses less digits than its factorization.

211664349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1809116 (or 1809113 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 211664349 is about 14548.6889100015. The cubic root of 211664349 is about 595.9583444980.

The spelling of 211664349 in words is "two hundred eleven million, six hundred sixty-four thousand, three hundred forty-nine".