1311232402540 has 48 divisors (see below), whose sum is σ = 2786187013344. Its totient is φ = 518300006400.

The previous prime is 1311232402517. The next prime is 1311232402541. The reversal of 1311232402540 is 452042321131.

It is a junction number, because it is equal to n+sod(n) for n = 1311232402499 and 1311232402508.

It is not an unprimeable number, because it can be changed into a prime (1311232402541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 771075 + ... + 1793605.

It is an arithmetic number, because the mean of its divisors is an integer number (58045562778).

Almost surely, 2^{1311232402540} is an apocalyptic number.

1311232402540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1311232402540 is an abundant number, since it is smaller than the sum of its proper divisors (1474954610804).

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

1311232402540 is a wasteful number, since it uses less digits than its factorization.

1311232402540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1023298 (or 1023296 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

Adding to 1311232402540 its reverse (452042321131), we get a palindrome (1763274723671).

The spelling of 1311232402540 in words is "one trillion, three hundred eleven billion, two hundred thirty-two million, four hundred two thousand, five hundred forty".