242565521 has 16 divisors (see below), whose sum is σ = 277699968. Its totient is φ = 209721600.

The previous prime is 242565511. The next prime is 242565559. The reversal of 242565521 is 125565242.

It is not a de Polignac number, because 242565521 - 2¹⁴ = 242549137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (242565511) 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 15 ways as a sum of consecutive naturals, for example, 43145 + ... + 48441.

It is an arithmetic number, because the mean of its divisors is an integer number (17356248).

Almost surely, 2^242565521 is an apocalyptic number.

It is an amenable number.

242565521 is a deficient number, since it is larger than the sum of its proper divisors (35134447).

242565521 is a wasteful number, since it uses less digits than its factorization.

242565521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5512.

The product of its digits is 24000, while the sum is 32.

The square root of 242565521 is about 15574.5151128374. The cubic root of 242565521 is about 623.6530103290.

The spelling of 242565521 in words is "two hundred forty-two million, five hundred sixty-five thousand, five hundred twenty-one".