1131131440 has 80 divisors (see below), whose sum is σ = 2713094208. Its totient is φ = 438248448.

The previous prime is 1131131437. The next prime is 1131131483. The reversal of 1131131440 is 441311311.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 777754 + ... + 779206.

Almost surely, 2^1131131440 is an apocalyptic number.

1131131440 is a gapful number since it is divisible by the number (10) 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 1131131440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1356547104).

1131131440 is an abundant number, since it is smaller than the sum of its proper divisors (1581962768).

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

1131131440 is a wasteful number, since it uses less digits than its factorization.

1131131440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1766 (or 1760 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 1131131440 is about 33632.2975724229. The cubic root of 1131131440 is about 1041.9279572651.

Adding to 1131131440 its reverse (441311311), we get a palindrome (1572442751).

The spelling of 1131131440 in words is "one billion, one hundred thirty-one million, one hundred thirty-one thousand, four hundred forty".