243942089 has 4 divisors (see below), whose sum is σ = 243976656. Its totient is φ = 243907524.

The previous prime is 243942067. The next prime is 243942103. The reversal of 243942089 is 980249342.

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 243942089 - 2⁸ = 243941833 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (243942019) 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, 2459 + ... + 22224.

It is an arithmetic number, because the mean of its divisors is an integer number (60994164).

Almost surely, 2^243942089 is an apocalyptic number.

It is an amenable number.

243942089 is a deficient number, since it is larger than the sum of its proper divisors (34567).

243942089 is an equidigital number, since it uses as much as digits as its factorization.

243942089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34566.

The product of its (nonzero) digits is 124416, while the sum is 41.

The square root of 243942089 is about 15618.6455558733. The cubic root of 243942089 is about 624.8305366690.

The spelling of 243942089 in words is "two hundred forty-three million, nine hundred forty-two thousand, eighty-nine".