1311156 has 108 divisors (see below), whose sum is σ = 4260256. Its totient is φ = 332640.

The previous prime is 1311143. The next prime is 1311173. The reversal of 1311156 is 6511131.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 30471 + ... + 30513.

2^1311156 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 1311156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2130128).

1311156 is an abundant number, since it is smaller than the sum of its proper divisors (2949100).

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

1311156 is a wasteful number, since it uses less digits than its factorization.

1311156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82 (or 66 counting only the distinct ones).

The product of its digits is 90, while the sum is 18.

The square root of 1311156 is about 1145.0572038112. The cubic root of 1311156 is about 109.4505938370.

Adding to 1311156 its reverse (6511131), we get a palindrome (7822287).

The spelling of 1311156 in words is "one million, three hundred eleven thousand, one hundred fifty-six".