1331141240 has 128 divisors (see below), whose sum is σ = 3632670720. Its totient is φ = 432345600.

The previous prime is 1331141233. The next prime is 1331141257. The reversal of 1331141240 is 421411331.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 173567 + ... + 181073.

It is an arithmetic number, because the mean of its divisors is an integer number (28380240).

Almost surely, 2^1331141240 is an apocalyptic number.

1331141240 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 1331141240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1816335360).

1331141240 is an abundant number, since it is smaller than the sum of its proper divisors (2301529480).

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

1331141240 is a wasteful number, since it uses less digits than its factorization.

1331141240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7573 (or 7569 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 1331141240 is about 36484.8083453922. The cubic root of 1331141240 is about 1100.0389077147.

Adding to 1331141240 its reverse (421411331), we get a palindrome (1752552571).

The spelling of 1331141240 in words is "one billion, three hundred thirty-one million, one hundred forty-one thousand, two hundred forty".