242009881 has 4 divisors (see below), whose sum is σ = 242064000. Its totient is φ = 241955764.

The previous prime is 242009879. The next prime is 242009893. The reversal of 242009881 is 188900242.

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.

It is a cyclic number.

It is not a de Polignac number, because 242009881 - 2¹ = 242009879 is a prime.

It is a super-2 number, since 2×242009881² = 117137565003268322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (242009861) 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, 19681 + ... + 29518.

It is an arithmetic number, because the mean of its divisors is an integer number (60516000).

Almost surely, 2^242009881 is an apocalyptic number.

It is an amenable number.

242009881 is a deficient number, since it is larger than the sum of its proper divisors (54119).

242009881 is an equidigital number, since it uses as much as digits as its factorization.

242009881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54118.

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 242009881 is about 15556.6667702307. Note that the first 3 decimals coincide. The cubic root of 242009881 is about 623.1764497578.

The spelling of 242009881 in words is "two hundred forty-two million, nine thousand, eight hundred eighty-one".