1311535240 has 32 divisors (see below), whose sum is σ = 2962733760. Its totient is φ = 522520000.

The previous prime is 1311535229. The next prime is 1311535241. The reversal of 1311535240 is 425351131.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1311535241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55276 + ... + 75355.

It is an arithmetic number, because the mean of its divisors is an integer number (92585430).

Almost surely, 2^1311535240 is an apocalyptic number.

1311535240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1311535240 is an abundant number, since it is smaller than the sum of its proper divisors (1651198520).

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

1311535240 is a wasteful number, since it uses less digits than its factorization.

1311535240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130893 (or 130889 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 1311535240 is about 36215.1244647868. The cubic root of 1311535240 is about 1094.6114535081.

Adding to 1311535240 its reverse (425351131), we get a palindrome (1736886371).

The spelling of 1311535240 in words is "one billion, three hundred eleven million, five hundred thirty-five thousand, two hundred forty".