1131323140 has 48 divisors (see below), whose sum is σ = 2553126912. Its totient is φ = 419544576.

The previous prime is 1131323113. The next prime is 1131323161. The reversal of 1131323140 is 413231311.

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, 2052 + ... + 47611.

It is an arithmetic number, because the mean of its divisors is an integer number (53190144).

Almost surely, 2^1131323140 is an apocalyptic number.

1131323140 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 1131323140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1276563456).

1131323140 is an abundant number, since it is smaller than the sum of its proper divisors (1421803772).

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

1131323140 is a wasteful number, since it uses less digits than its factorization.

1131323140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49756 (or 49754 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 1131323140 is about 33635.1473907875. The cubic root of 1131323140 is about 1041.9868146474.

Adding to 1131323140 its reverse (413231311), we get a palindrome (1544554451).

It can be divided in two parts, 11313 and 23140, that added together give a triangular number (34453 = T₂₆₂).

The spelling of 1131323140 in words is "one billion, one hundred thirty-one million, three hundred twenty-three thousand, one hundred forty".