231133240 has 32 divisors (see below), whose sum is σ = 560054880. Its totient is φ = 85341312.

The previous prime is 231133237. The next prime is 231133261. The reversal of 231133240 is 42331132.

231133240 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

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 in 7 ways as a sum of consecutive naturals, for example, 221724 + ... + 222763.

It is an arithmetic number, because the mean of its divisors is an integer number (17501715).

Almost surely, 2^231133240 is an apocalyptic number.

231133240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231133240 is an abundant number, since it is smaller than the sum of its proper divisors (328921640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231133240 is a wasteful number, since it uses less digits than its factorization.

231133240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444511 (or 444507 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 231133240 is about 15203.0667958804. The cubic root of 231133240 is about 613.6971914195.

Adding to 231133240 its reverse (42331132), we get a palindrome (273464372).

The spelling of 231133240 in words is "two hundred thirty-one million, one hundred thirty-three thousand, two hundred forty".