242409991 has 4 divisors (see below), whose sum is σ = 242470800. Its totient is φ = 242349184.

The previous prime is 242409983. The next prime is 242410001. The reversal of 242409991 is 199904242.

242409991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 242409991 - 2³ = 242409983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (242409931) 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, 23971 + ... + 32548.

It is an arithmetic number, because the mean of its divisors is an integer number (60617700).

Almost surely, 2^242409991 is an apocalyptic number.

242409991 is a deficient number, since it is larger than the sum of its proper divisors (60809).

242409991 is an equidigital number, since it uses as much as digits as its factorization.

242409991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60808.

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 242409991 is about 15569.5212193567. The cubic root of 242409991 is about 623.5196889749.

The spelling of 242409991 in words is "two hundred forty-two million, four hundred nine thousand, nine hundred ninety-one".