1131323240 has 32 divisors (see below), whose sum is σ = 2546543880. Its totient is φ = 452339712.

The previous prime is 1131323189. The next prime is 1131323243. The reversal of 1131323240 is 423231311.

It can be written as a sum of positive squares in 4 ways, for example, as 1131245956 + 77284 = 33634^2 + 278^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (1131323243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 128252 + ... + 136788.

Almost surely, 2^1131323240 is an apocalyptic number.

1131323240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1131323240 is an abundant number, since it is smaller than the sum of its proper divisors (1415220640).

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

1131323240 is a wasteful number, since it uses less digits than its factorization.

1131323240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11861 (or 11857 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 1131323240 is about 33635.1488773277. The cubic root of 1131323240 is about 1041.9868453485.

Adding to 1131323240 its reverse (423231311), we get a palindrome (1554554551).

The spelling of 1131323240 in words is "one billion, one hundred thirty-one million, three hundred twenty-three thousand, two hundred forty".