240661 has 4 divisors (see below), whose sum is σ = 244800. Its totient is φ = 236524.

The previous prime is 240659. The next prime is 240677. The reversal of 240661 is 166042.

240661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 240661 - 2¹ = 240659 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (240631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1981 + ... + 2098.

It is an arithmetic number, because the mean of its divisors is an integer number (61200).

2²⁴⁰⁶⁶¹ is an apocalyptic number.

It is an amenable number.

240661 is a deficient number, since it is larger than the sum of its proper divisors (4139).

240661 is an equidigital number, since it uses as much as digits as its factorization.

240661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4138.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 240661 is about 490.5721149841. The cubic root of 240661 is about 62.2016500632.

The spelling of 240661 in words is "two hundred forty thousand, six hundred sixty-one".