242561 has 4 divisors (see below), whose sum is σ = 264624. Its totient is φ = 220500.

The previous prime is 242551. The next prime is 242591. The reversal of 242561 is 165242.

It is a happy number.

242561 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 242561 - 2¹⁰ = 241537 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (242521) 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, 11015 + ... + 11036.

It is an arithmetic number, because the mean of its divisors is an integer number (66156).

2²⁴²⁵⁶¹ is an apocalyptic number.

It is an amenable number.

242561 is a deficient number, since it is larger than the sum of its proper divisors (22063).

242561 is a wasteful number, since it uses less digits than its factorization.

242561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22062.

The product of its digits is 480, while the sum is 20.

The square root of 242561 is about 492.5048223114. The cubic root of 242561 is about 62.3649135702.

The spelling of 242561 in words is "two hundred forty-two thousand, five hundred sixty-one".