1311256056 has 64 divisors (see below), whose sum is σ = 3592350720. Its totient is φ = 395550720.

The previous prime is 1311256043. The next prime is 1311256057. The reversal of 1311256056 is 6506521131.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311256057) 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, 47736 + ... + 70008.

It is an arithmetic number, because the mean of its divisors is an integer number (56130480).

Almost surely, 2^1311256056 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1311256056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1796175360).

1311256056 is an abundant number, since it is smaller than the sum of its proper divisors (2281094664).

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

1311256056 is a wasteful number, since it uses less digits than its factorization.

1311256056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22516 (or 22512 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 1311256056 is about 36211.2697374726. The cubic root of 1311256056 is about 1094.5337787136.

Adding to 1311256056 its reverse (6506521131), we get a palindrome (7817777187).

The spelling of 1311256056 in words is "one billion, three hundred eleven million, two hundred fifty-six thousand, fifty-six".