231133530 has 96 divisors (see below), whose sum is σ = 601582464. Its totient is φ = 56802304.

The previous prime is 231133517. The next prime is 231133541. The reversal of 231133530 is 35331132.

231133530 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×231133530³ (a number of 26 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 231133497 and 231133506.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 459259 + ... + 459761.

It is an arithmetic number, because the mean of its divisors is an integer number (6266484).

Almost surely, 2^231133530 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231133530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (300791232).

231133530 is an abundant number, since it is smaller than the sum of its proper divisors (370448934).

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

231133530 is a wasteful number, since it uses less digits than its factorization.

231133530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 600 (or 583 counting only the distinct ones).

The product of its (nonzero) digits is 810, while the sum is 21.

The square root of 231133530 is about 15203.0763334267. The cubic root of 231133530 is about 613.6974480855.

Adding to 231133530 its reverse (35331132), we get a palindrome (266464662).

The spelling of 231133530 in words is "two hundred thirty-one million, one hundred thirty-three thousand, five hundred thirty".