242202209 has 4 divisors (see below), whose sum is σ = 246772116. Its totient is φ = 237632304.

The previous prime is 242202203. The next prime is 242202221. The reversal of 242202209 is 902202242.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 902202242 = 2 ⋅451101121.

It can be written as a sum of positive squares in 2 ways, for example, as 214534609 + 27667600 = 14647^2 + 5260^2 .

It is a cyclic number.

It is not a de Polignac number, because 242202209 - 2¹² = 242198113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (242202203) by changing a digit.

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, 2284874 + ... + 2284979.

It is an arithmetic number, because the mean of its divisors is an integer number (61693029).

Almost surely, 2^242202209 is an apocalyptic number.

It is an amenable number.

242202209 is a deficient number, since it is larger than the sum of its proper divisors (4569907).

242202209 is an equidigital number, since it uses as much as digits as its factorization.

242202209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4569906.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 242202209 is about 15562.8470724350. The cubic root of 242202209 is about 623.3414878461.

The spelling of 242202209 in words is "two hundred forty-two million, two hundred two thousand, two hundred nine".