2143287216009 has 27 divisors (see below), whose sum is σ = 3110897212839. Its totient is φ = 1421951006160.

The previous prime is 2143287215999. The next prime is 2143287216017. The reversal of 2143287216009 is 9006127823412.

The square root of 2143287216009 is 1463997.

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

2143287216009 is a `hidden beast` number, since 2 + 1 + 4 + 32 + 8 + 7 + 2 + 1 + 600 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1996153599609 + 147133616400 = 1412853^2 + 383580^2 .

It is a de Polignac number, because none of the positive numbers 2^k-2143287216009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2143287216019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1005764874 + ... + 1005767004.

Almost surely, 2^{2143287216009} is an apocalyptic number.

2143287216009 is the 1463997-th square number.

2143287216009 is the 731999-th centered octagonal number.

It is an amenable number.

2143287216009 is a deficient number, since it is larger than the sum of its proper divisors (967609996830).

2143287216009 is an frugal number, since it uses more digits than its factorization.

2143287216009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4726 (or 2363 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

It can be divided in two parts, 2143287 and 216009, that added together give a square (2359296 = 1536²).

The spelling of 2143287216009 in words is "two trillion, one hundred forty-three billion, two hundred eighty-seven million, two hundred sixteen thousand, nine".