211080305131609 has 3 divisors (see below), whose sum is σ = 211080319660213. Its totient is φ = 211080290603006.

The previous prime is 211080305131583. The next prime is 211080305131621. The reversal of 211080305131609 is 906131503080112.

The square root of 211080305131609 is 14528603.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a de Polignac number, because none of the positive numbers 2^k-211080305131609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211080305131009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 7264302 + ... + 21792904.

Almost surely, 2^{211080305131609} is an apocalyptic number.

211080305131609 is the 14528603-rd square number.

211080305131609 is the 7264302-nd centered octagonal number.

It is an amenable number.

211080305131609 is a deficient number, since it is larger than the sum of its proper divisors (14528604).

211080305131609 is an frugal number, since it uses more digits than its factorization.

211080305131609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29057206 (or 14528603 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 40.

The spelling of 211080305131609 in words is "two hundred eleven trillion, eighty billion, three hundred five million, one hundred thirty-one thousand, six hundred nine".