231311120 has 20 divisors (see below), whose sum is σ = 537798540. Its totient is φ = 92524416.

The previous prime is 231311107. The next prime is 231311153. The reversal of 231311120 is 21113132.

It can be written as a sum of positive squares in 2 ways, for example, as 66650896 + 164660224 = 8164^2 + 12832^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a nialpdrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 231311095 and 231311104.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1445615 + ... + 1445774.

It is an arithmetic number, because the mean of its divisors is an integer number (26889927).

Almost surely, 2^231311120 is an apocalyptic number.

231311120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231311120 is an abundant number, since it is smaller than the sum of its proper divisors (306487420).

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

231311120 is a wasteful number, since it uses less digits than its factorization.

231311120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2891402 (or 2891396 counting only the distinct ones).

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

The square root of 231311120 is about 15208.9158061974. The cubic root of 231311120 is about 613.8545847108.

Adding to 231311120 its reverse (21113132), we get a palindrome (252424252).

The spelling of 231311120 in words is "two hundred thirty-one million, three hundred eleven thousand, one hundred twenty".