1131343240 has 64 divisors (see below), whose sum is σ = 2602958400. Its totient is φ = 442430208.

The previous prime is 1131343219. The next prime is 1131343261. The reversal of 1131343240 is 423431311.

It is an interprime number because it is at equal distance from previous prime (1131343219) and next prime (1131343261).

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, 371002 + ... + 374038.

It is an arithmetic number, because the mean of its divisors is an integer number (40671225).

Almost surely, 2^1131343240 is an apocalyptic number.

1131343240 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 1131343240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1301479200).

1131343240 is an abundant number, since it is smaller than the sum of its proper divisors (1471615160).

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

1131343240 is a wasteful number, since it uses less digits than its factorization.

1131343240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3254 (or 3250 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 1131343240 is about 33635.4461840482. The cubic root of 1131343240 is about 1041.9929855371.

Adding to 1131343240 its reverse (423431311), we get a palindrome (1554774551).

The spelling of 1131343240 in words is "one billion, one hundred thirty-one million, three hundred forty-three thousand, two hundred forty".