242099009 has 4 divisors (see below), whose sum is σ = 242132016. Its totient is φ = 242066004.

The previous prime is 242099003. The next prime is 242099051. The reversal of 242099009 is 900990242.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-242099009 is a prime.

It is a super-2 number, since 2×242099009² = 117223860317564162, which contains 22 as substring.

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 242099009.

It is not an unprimeable number, because it can be changed into a prime (242099003) 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, 2 + ... + 22004.

It is an arithmetic number, because the mean of its divisors is an integer number (60533004).

Almost surely, 2^242099009 is an apocalyptic number.

It is an amenable number.

242099009 is a deficient number, since it is larger than the sum of its proper divisors (33007).

242099009 is a wasteful number, since it uses less digits than its factorization.

242099009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33006.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 242099009 is about 15559.5311304679. The cubic root of 242099009 is about 623.2529420251.

The spelling of 242099009 in words is "two hundred forty-two million, ninety-nine thousand, nine".