243308387169 has 21 divisors (see below), whose sum is σ = 364815671683. Its totient is φ = 162196712712.

The previous prime is 243308387137. The next prime is 243308387177. The reversal of 243308387169 is 961783803342.

The square root of 243308387169 is 493263.

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

243308387169 is a `hidden beast` number, since 2 + 433 + 0 + 83 + 8 + 71 + 69 = 666.

It can be written as a sum of positive squares in only one way, i.e., 175843519569 + 67464867600 = 419337^2 + 259740^2 .

It is not a de Polignac number, because 243308387169 - 2⁵ = 243308387137 is a prime.

It is a super-2 number, since 2×243308387169² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (243308387369) by changing a digit.

It is a polite number, since it can be written in 20 ways as a sum of consecutive naturals, for example, 13308967 + ... + 13327235.

Almost surely, 2^243308387169 is an apocalyptic number.

243308387169 is the 493263-rd square number.

243308387169 is the 246632-nd centered octagonal number.

It is an amenable number.

243308387169 is a deficient number, since it is larger than the sum of its proper divisors (121507284514).

243308387169 is an frugal number, since it uses more digits than its factorization.

243308387169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36556 (or 18272 counting only the distinct ones).

The product of its (nonzero) digits is 5225472, while the sum is 54.

It can be divided in two parts, 2433083 and 87169, that added together give a palindrome (2520252).

The spelling of 243308387169 in words is "two hundred forty-three billion, three hundred eight million, three hundred eighty-seven thousand, one hundred sixty-nine".