242231987 has 4 divisors (see below), whose sum is σ = 242514840. Its totient is φ = 241949136.

The previous prime is 242231981. The next prime is 242231999. The reversal of 242231987 is 789132242.

242231987 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, and also an emirpimes, since its reverse is a distinct semiprime: 789132242 = 2 ⋅394566121.

It is a cyclic number.

It is not a de Polignac number, because 242231987 - 2⁴ = 242231971 is a prime.

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 242231987.

It is not an unprimeable number, because it can be changed into a prime (242231981) 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, 140138 + ... + 141855.

It is an arithmetic number, because the mean of its divisors is an integer number (60628710).

Almost surely, 2^242231987 is an apocalyptic number.

242231987 is a deficient number, since it is larger than the sum of its proper divisors (282853).

242231987 is an equidigital number, since it uses as much as digits as its factorization.

242231987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282852.

The product of its digits is 48384, while the sum is 38.

The square root of 242231987 is about 15563.8037445863. The cubic root of 242231987 is about 623.3670327579.

The spelling of 242231987 in words is "two hundred forty-two million, two hundred thirty-one thousand, nine hundred eighty-seven".