231240242 has 4 divisors (see below), whose sum is σ = 346860366. Its totient is φ = 115620120.

The previous prime is 231240199. The next prime is 231240263. The reversal of 231240242 is 242042132.

231240242 is digitally balanced in base 3, 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 can be written as a sum of positive squares in only one way, i.e., 202521361 + 28718881 = 14231^2 + 5359^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 57810059 + ... + 57810062.

Almost surely, 2^231240242 is an apocalyptic number.

231240242 is a deficient number, since it is larger than the sum of its proper divisors (115620124).

231240242 is a wasteful number, since it uses less digits than its factorization.

231240242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115620123.

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 231240242 is about 15206.5854812972. The cubic root of 231240242 is about 613.7918795110.

Adding to 231240242 its reverse (242042132), we get a palindrome (473282374).

The spelling of 231240242 in words is "two hundred thirty-one million, two hundred forty thousand, two hundred forty-two".