243561312 has 72 divisors (see below), whose sum is σ = 733385016. Its totient is φ = 76409856.

The previous prime is 243561301. The next prime is 243561347. The reversal of 243561312 is 213165342.

243561312 is a `hidden beast` number, since 2 + 4 + 35 + 613 + 12 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a super-2 number, since 2×243561312² = 118644225406322688, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19978 + ... + 29769.

It is an arithmetic number, because the mean of its divisors is an integer number (10185903).

Almost surely, 2^243561312 is an apocalyptic number.

It is an amenable number.

243561312 is an abundant number, since it is smaller than the sum of its proper divisors (489823704).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

243561312 is a wasteful number, since it uses less digits than its factorization.

243561312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49780 (or 49769 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 243561312 is about 15606.4509738762. The cubic root of 243561312 is about 624.5052613839.

The spelling of 243561312 in words is "two hundred forty-three million, five hundred sixty-one thousand, three hundred twelve".