243772275289 has 3 divisors (see below), whose sum is σ = 243772769023. Its totient is φ = 243771781556.

The previous prime is 243772275259. The next prime is 243772275401. The reversal of 243772275289 is 982572277342.

The square root of 243772275289 is 493733.

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 can be written as a sum of positive squares in only one way, i.e., 169847015625 + 73925259664 = 412125^2 + 271892^2 .

It is not a de Polignac number, because 243772275289 - 2²¹ = 243770178137 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243772275239) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 246867 + ... + 740599.

Almost surely, 2^243772275289 is an apocalyptic number.

243772275289 is the 493733-rd square number.

243772275289 is the 246867-th centered octagonal number.

It is an amenable number.

243772275289 is a deficient number, since it is larger than the sum of its proper divisors (493734).

243772275289 is an frugal number, since it uses more digits than its factorization.

243772275289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 987466 (or 493733 counting only the distinct ones).

The product of its digits is 23708160, while the sum is 58.

The spelling of 243772275289 in words is "two hundred forty-three billion, seven hundred seventy-two million, two hundred seventy-five thousand, two hundred eighty-nine".