231131120 has 40 divisors (see below), whose sum is σ = 586234800. Its totient is φ = 84047360.

The previous prime is 231131111. The next prime is 231131123. The reversal of 231131120 is 21131132.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 231131095 and 231131104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231131123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 130445 + ... + 132204.

It is an arithmetic number, because the mean of its divisors is an integer number (14655870).

Almost surely, 2^231131120 is an apocalyptic number.

231131120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231131120 is an abundant number, since it is smaller than the sum of its proper divisors (355103680).

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

231131120 is a wasteful number, since it uses less digits than its factorization.

231131120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262673 (or 262667 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 231131120 is about 15202.9970729458. The cubic root of 231131120 is about 613.6953150963.

Adding to 231131120 its reverse (21131132), we get a palindrome (252262252).

The spelling of 231131120 in words is "two hundred thirty-one million, one hundred thirty-one thousand, one hundred twenty".