242839561 has 4 divisors (see below), whose sum is σ = 242875152. Its totient is φ = 242803972.

The previous prime is 242839549. The next prime is 242839567. The reversal of 242839561 is 165938242.

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 242839561 - 2⁹ = 242839049 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (242839567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3991 + ... + 22396.

It is an arithmetic number, because the mean of its divisors is an integer number (60718788).

Almost surely, 2^242839561 is an apocalyptic number.

It is an amenable number.

242839561 is a deficient number, since it is larger than the sum of its proper divisors (35591).

242839561 is an equidigital number, since it uses as much as digits as its factorization.

242839561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35590.

The product of its digits is 103680, while the sum is 40.

The square root of 242839561 is about 15583.3103350989. The cubic root of 242839561 is about 623.8877806430.

The spelling of 242839561 in words is "two hundred forty-two million, eight hundred thirty-nine thousand, five hundred sixty-one".