240243561 has 6 divisors (see below), whose sum is σ = 347018490. Its totient is φ = 160162368.

The previous prime is 240243551. The next prime is 240243599. The reversal of 240243561 is 165342042.

It can be written as a sum of positive squares in only one way, i.e., 162715536 + 77528025 = 12756^2 + 8805^2 .

It is not a de Polignac number, because 240243561 - 2⁷ = 240243433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (240243551) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13346856 + ... + 13346873.

It is an arithmetic number, because the mean of its divisors is an integer number (57836415).

Almost surely, 2^240243561 is an apocalyptic number.

It is an amenable number.

240243561 is a deficient number, since it is larger than the sum of its proper divisors (106774929).

240243561 is a wasteful number, since it uses less digits than its factorization.

240243561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26693735 (or 26693732 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 240243561 is about 15499.7922889308. The cubic root of 240243561 is about 621.6566525215.

The spelling of 240243561 in words is "two hundred forty million, two hundred forty-three thousand, five hundred sixty-one".