231031404 has 72 divisors (see below), whose sum is σ = 605758608. Its totient is φ = 74183040.

The previous prime is 231031403. The next prime is 231031417. The reversal of 231031404 is 404130132.

231031404 is a `hidden beast` number, since 231 + 0 + 31 + 404 = 666.

It is a super-2 number, since 2×231031404² = 106751019268422432, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231031403) 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 23 ways as a sum of consecutive naturals, for example, 141714 + ... + 143334.

It is an arithmetic number, because the mean of its divisors is an integer number (8413314).

Almost surely, 2^231031404 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231031404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (302879304).

231031404 is an abundant number, since it is smaller than the sum of its proper divisors (374727204).

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

231031404 is a wasteful number, since it uses less digits than its factorization.

231031404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1775 (or 1770 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 231031404 is about 15199.7172342120. The cubic root of 231031404 is about 613.6070476739.

Adding to 231031404 its reverse (404130132), we get a palindrome (635161536).

The spelling of 231031404 in words is "two hundred thirty-one million, thirty-one thousand, four hundred four".