2311231140 has 72 divisors (see below), whose sum is σ = 7024425408. Its totient is φ = 615124800.

The previous prime is 2311231127. The next prime is 2311231171. The reversal of 2311231140 is 411321132.

2311231140 is a `hidden beast` number, since 2 + 311 + 2 + 311 + 40 = 666.

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

It is an unprimeable number.

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, 81865 + ... + 106415.

It is an arithmetic number, because the mean of its divisors is an integer number (97561464).

Almost surely, 2^2311231140 is an apocalyptic number.

2311231140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2311231140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3512212704).

2311231140 is an abundant number, since it is smaller than the sum of its proper divisors (4713194268).

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

2311231140 is a wasteful number, since it uses less digits than its factorization.

2311231140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25089 (or 25084 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 2311231140 is about 48075.2653658823. The cubic root of 2311231140 is about 1322.1512098900.

Adding to 2311231140 its reverse (411321132), we get a palindrome (2722552272).

The spelling of 2311231140 in words is "two billion, three hundred eleven million, two hundred thirty-one thousand, one hundred forty".