1311256 has 16 divisors (see below), whose sum is σ = 2499840. Its totient is φ = 644640.

The previous prime is 1311251. The next prime is 1311259. The reversal of 1311256 is 6521131.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 856 + ... + 1831.

It is an arithmetic number, because the mean of its divisors is an integer number (156240).

2^1311256 is an apocalyptic number.

It is an amenable number.

1311256 is a deficient number, since it is larger than the sum of its proper divisors (1188584).

1311256 is a wasteful number, since it uses less digits than its factorization.

1311256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2754 (or 2750 counting only the distinct ones).

The product of its digits is 180, while the sum is 19.

The square root of 1311256 is about 1145.1008689194. The cubic root of 1311256 is about 109.4533763132.

Adding to 1311256 its reverse (6521131), we get a palindrome (7832387).

It can be divided in two parts, 131125 and 6, that added together give a palindrome (131131).

The spelling of 1311256 in words is "one million, three hundred eleven thousand, two hundred fifty-six".