242568409 has 4 divisors (see below), whose sum is σ = 242605540. Its totient is φ = 242531280.

The previous prime is 242568407. The next prime is 242568467. The reversal of 242568409 is 904865242.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 904865242 = 2 ⋅452432621.

It can be written as a sum of positive squares in 2 ways, for example, as 199600384 + 42968025 = 14128^2 + 6555^2 .

It is a cyclic number.

It is not a de Polignac number, because 242568409 - 2¹ = 242568407 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (242568401) 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, 5874 + ... + 22795.

It is an arithmetic number, because the mean of its divisors is an integer number (60651385).

Almost surely, 2^242568409 is an apocalyptic number.

It is an amenable number.

242568409 is a deficient number, since it is larger than the sum of its proper divisors (37131).

242568409 is an equidigital number, since it uses as much as digits as its factorization.

242568409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37130.

The product of its (nonzero) digits is 138240, while the sum is 40.

The square root of 242568409 is about 15574.6078281285. The cubic root of 242568409 is about 623.6554854028.

The spelling of 242568409 in words is "two hundred forty-two million, five hundred sixty-eight thousand, four hundred nine".