231145530 has 128 divisors (see below), whose sum is σ = 706682880. Its totient is φ = 46986240.

The previous prime is 231145451. The next prime is 231145567. The reversal of 231145530 is 35541132.

231145530 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 231145530.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 107506 + ... + 109634.

It is an arithmetic number, because the mean of its divisors is an integer number (5520960).

Almost surely, 2^231145530 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231145530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (353341440).

231145530 is an abundant number, since it is smaller than the sum of its proper divisors (475537350).

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

231145530 is a wasteful number, since it uses less digits than its factorization.

231145530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2204.

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 231145530 is about 15203.4709852718. The cubic root of 231145530 is about 613.7080685581.

Adding to 231145530 its reverse (35541132), we get a palindrome (266686662).

The spelling of 231145530 in words is "two hundred thirty-one million, one hundred forty-five thousand, five hundred thirty".