243545211009 has 27 divisors (see below), whose sum is σ = 354149162913. Its totient is φ = 161280728424.

The previous prime is 243545211001. The next prime is 243545211089. The reversal of 243545211009 is 900112545342.

The square root of 243545211009 is 493503.

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

243545211009 is a `hidden beast` number, since 2 + 4 + 3 + 545 + 2 + 1 + 100 + 9 = 666.

It is not a de Polignac number, because 243545211009 - 2³ = 243545211001 is a prime.

It is a super-3 number, since 3×243545211009³ (a number of 35 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (243545211001) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 265010652 + ... + 265011570.

Almost surely, 2^243545211009 is an apocalyptic number.

243545211009 is the 493503-rd square number.

243545211009 is the 246752-nd centered octagonal number.

It is an amenable number.

243545211009 is a deficient number, since it is larger than the sum of its proper divisors (110603951904).

243545211009 is an frugal number, since it uses more digits than its factorization.

243545211009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2202 (or 1101 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

Multiplying 243545211009 by its sum of digits (36), we get a square (8767627596324 = 2961018²).

The spelling of 243545211009 in words is "two hundred forty-three billion, five hundred forty-five million, two hundred eleven thousand, nine".