1131316440 has 128 divisors (see below), whose sum is σ = 3538632960. Its totient is φ = 289073664.

The previous prime is 1131316423. The next prime is 1131316447. The reversal of 1131316440 is 446131311.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 1131316440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131316447) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 295579 + ... + 299381.

It is an arithmetic number, because the mean of its divisors is an integer number (27645570).

Almost surely, 2^1131316440 is an apocalyptic number.

1131316440 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 1131316440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1769316480).

1131316440 is an abundant number, since it is smaller than the sum of its proper divisors (2407316520).

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

1131316440 is a wasteful number, since it uses less digits than its factorization.

1131316440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3921 (or 3917 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 1131316440 is about 33635.0477924441. The cubic root of 1131316440 is about 1041.9847576679.

Adding to 1131316440 its reverse (446131311), we get a palindrome (1577447751).

The spelling of 1131316440 in words is "one billion, one hundred thirty-one million, three hundred sixteen thousand, four hundred forty".