242564155 has 4 divisors (see below), whose sum is σ = 291076992. Its totient is φ = 194051320.

The previous prime is 242564099. The next prime is 242564167. The reversal of 242564155 is 551465242.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 242564155 - 2¹¹ = 242562107 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 242564155.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24256411 + ... + 24256420.

It is an arithmetic number, because the mean of its divisors is an integer number (72769248).

Almost surely, 2^242564155 is an apocalyptic number.

242564155 is a deficient number, since it is larger than the sum of its proper divisors (48512837).

242564155 is an equidigital number, since it uses as much as digits as its factorization.

242564155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48512836.

The product of its digits is 48000, while the sum is 34.

The square root of 242564155 is about 15574.4712590829. The cubic root of 242564155 is about 623.6518396327.

The spelling of 242564155 in words is "two hundred forty-two million, five hundred sixty-four thousand, one hundred fifty-five".