209130911 has 16 divisors (see below), whose sum is σ = 233078688. Its totient is φ = 186048000.

The previous prime is 209130907. The next prime is 209130917. The reversal of 209130911 is 119031902.

It is a cyclic number.

It is not a de Polignac number, because 209130911 - 2² = 209130907 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209130917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 109061 + ... + 110961.

It is an arithmetic number, because the mean of its divisors is an integer number (14567418).

Almost surely, 2^209130911 is an apocalyptic number.

209130911 is a deficient number, since it is larger than the sum of its proper divisors (23947777).

209130911 is a wasteful number, since it uses less digits than its factorization.

209130911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2122.

The product of its (nonzero) digits is 486, while the sum is 26.

The square root of 209130911 is about 14461.3592376374. The cubic root of 209130911 is about 593.5710937103.

Subtracting from 209130911 its reverse (119031902), we obtain a palindrome (90099009).

The spelling of 209130911 in words is "two hundred nine million, one hundred thirty thousand, nine hundred eleven".