243823634211609 has 9 divisors (see below), whose sum is σ = 352189761525589. Its totient is φ = 162549058244700.

The previous prime is 243823634211607. The next prime is 243823634211623. The reversal of 243823634211609 is 906112436328342.

The square root of 243823634211609 is 15614853.

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

243823634211609 is a `hidden beast` number, since 2 + 4 + 3 + 8 + 2 + 3 + 6 + 3 + 4 + 21 + 1 + 609 = 666.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 243823634211609 - 2¹ = 243823634211607 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243823634211607) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 44242084 + ... + 49447034.

Almost surely, 2^{243823634211609} is an apocalyptic number.

243823634211609 is the 15614853-rd square number.

243823634211609 is the 7807427-th centered octagonal number.

It is an amenable number.

243823634211609 is a deficient number, since it is larger than the sum of its proper divisors (108366127313980).

243823634211609 is an frugal number, since it uses more digits than its factorization.

243823634211609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10409908 (or 5204954 counting only the distinct ones).

The product of its (nonzero) digits is 8957952, while the sum is 54.

The spelling of 243823634211609 in words is "two hundred forty-three trillion, eight hundred twenty-three billion, six hundred thirty-four million, two hundred eleven thousand, six hundred nine".