231831564 has 12 divisors (see below), whose sum is σ = 540940344. Its totient is φ = 77277184.

The previous prime is 231831563. The next prime is 231831581. The reversal of 231831564 is 465138132.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (231831563) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 9659637 + ... + 9659660.

It is an arithmetic number, because the mean of its divisors is an integer number (45078362).

Almost surely, 2^231831564 is an apocalyptic number.

It is an amenable number.

231831564 is an abundant number, since it is smaller than the sum of its proper divisors (309108780).

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

231831564 is a wasteful number, since it uses less digits than its factorization.

231831564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19319304 (or 19319302 counting only the distinct ones).

The product of its digits is 17280, while the sum is 33.

The square root of 231831564 is about 15226.0160252116. The cubic root of 231831564 is about 614.3146254697.

Adding to 231831564 its reverse (465138132), we get a palindrome (696969696).

The spelling of 231831564 in words is "two hundred thirty-one million, eight hundred thirty-one thousand, five hundred sixty-four".