1311263541240 has 64 divisors (see below), whose sum is σ = 3934422581760. Its totient is φ = 349614103680.

The previous prime is 1311263541223. The next prime is 1311263541271. The reversal of 1311263541240 is 421453621131.

It is a congruent number.

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, 124956 + ... + 1624235.

It is an arithmetic number, because the mean of its divisors is an integer number (61475352840).

Almost surely, 2^{1311263541240} is an apocalyptic number.

1311263541240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1311263541240 is an abundant number, since it is smaller than the sum of its proper divisors (2623159040520).

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

1311263541240 is a wasteful number, since it uses less digits than its factorization.

1311263541240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1755452 (or 1755448 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 33.

The spelling of 1311263541240 in words is "one trillion, three hundred eleven billion, two hundred sixty-three million, five hundred forty-one thousand, two hundred forty".