231140242 has 4 divisors (see below), whose sum is σ = 346710366. Its totient is φ = 115570120.

The previous prime is 231140227. The next prime is 231140243. The reversal of 231140242 is 242041132.

231140242 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., 216707841 + 14432401 = 14721^2 + 3799^2 .

It is a super-2 number, since 2×231140242² = 106851622943637128, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (231140243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57785059 + ... + 57785062.

Almost surely, 2^231140242 is an apocalyptic number.

231140242 is a deficient number, since it is larger than the sum of its proper divisors (115570124).

231140242 is a wasteful number, since it uses less digits than its factorization.

231140242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115570123.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 231140242 is about 15203.2970766212. The cubic root of 231140242 is about 613.7033885151.

Adding to 231140242 its reverse (242041132), we get a palindrome (473181374).

The spelling of 231140242 in words is "two hundred thirty-one million, one hundred forty thousand, two hundred forty-two".