211640949 has 24 divisors (see below), whose sum is σ = 329790552. Its totient is φ = 130014720.

The previous prime is 211640909. The next prime is 211641011. The reversal of 211640949 is 949046112.

It is a happy number.

211640949 is a `hidden beast` number, since 2 + 1 + 1 + 640 + 9 + 4 + 9 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 10284849 + 201356100 = 3207^2 + 14190^2 .

It is not a de Polignac number, because 211640949 - 2⁹ = 211640437 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211640909) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 87849 + ... + 90225.

It is an arithmetic number, because the mean of its divisors is an integer number (13741273).

Almost surely, 2^211640949 is an apocalyptic number.

It is an amenable number.

211640949 is a deficient number, since it is larger than the sum of its proper divisors (118149603).

211640949 is a wasteful number, since it uses less digits than its factorization.

211640949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3157 (or 3154 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 211640949 is about 14547.8846915969. The cubic root of 211640949 is about 595.9363821485.

The spelling of 211640949 in words is "two hundred eleven million, six hundred forty thousand, nine hundred forty-nine".