243561969 has 48 divisors (see below), whose sum is σ = 425318400. Its totient is φ = 131204448.

The previous prime is 243561949. The next prime is 243562013. The reversal of 243561969 is 969165342.

243561969 is a `hidden beast` number, since 24 + 3 + 5 + 619 + 6 + 9 = 666.

It is not a de Polignac number, because 243561969 - 2¹⁵ = 243529201 is a prime.

It is a super-2 number, since 2×243561969² = 118644865486313922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (243561949) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 338392 + ... + 339110.

It is an arithmetic number, because the mean of its divisors is an integer number (8860800).

Almost surely, 2^243561969 is an apocalyptic number.

It is an amenable number.

243561969 is a deficient number, since it is larger than the sum of its proper divisors (181756431).

243561969 is a wasteful number, since it uses less digits than its factorization.

243561969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1034 (or 1031 counting only the distinct ones).

The product of its digits is 349920, while the sum is 45.

The square root of 243561969 is about 15606.4720228500. The cubic root of 243561969 is about 624.5058229121.

The spelling of 243561969 in words is "two hundred forty-three million, five hundred sixty-one thousand, nine hundred sixty-nine".