243561616 has 40 divisors (see below), whose sum is σ = 482984960. Its totient is φ = 118952064.

The previous prime is 243561611. The next prime is 243561629. The reversal of 243561616 is 616165342.

It is not an unprimeable number, because it can be changed into a prime (243561611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135250 + ... + 137038.

It is an arithmetic number, because the mean of its divisors is an integer number (12074624).

Almost surely, 2^243561616 is an apocalyptic number.

It is an amenable number.

243561616 is a deficient number, since it is larger than the sum of its proper divisors (239423344).

243561616 is a wasteful number, since it uses less digits than its factorization.

243561616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1991 (or 1985 counting only the distinct ones).

The product of its digits is 25920, while the sum is 34.

The square root of 243561616 is about 15606.4607134353. The cubic root of 243561616 is about 624.5055212083.

The spelling of 243561616 in words is "two hundred forty-three million, five hundred sixty-one thousand, six hundred sixteen".