1131256 has 16 divisors (see below), whose sum is σ = 2424240. Its totient is φ = 484800.

The previous prime is 1131253. The next prime is 1131259. The reversal of 1131256 is 6521311.

1131256 = 399² + 400² + ... + 405².

It is an interprime number because it is at equal distance from previous prime (1131253) and next prime (1131259).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131253) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10045 + ... + 10156.

It is an arithmetic number, because the mean of its divisors is an integer number (151515).

2^1131256 is an apocalyptic number.

It is an amenable number.

1131256 is an abundant number, since it is smaller than the sum of its proper divisors (1292984).

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

1131256 is a wasteful number, since it uses less digits than its factorization.

1131256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20214 (or 20210 counting only the distinct ones).

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

The square root of 1131256 is about 1063.6051899084. The cubic root of 1131256 is about 104.1966201504.

Adding to 1131256 its reverse (6521311), we get a palindrome (7652567).

It can be divided in two parts, 113 and 1256, that added together give a square (1369 = 37²).

The spelling of 1131256 in words is "one million, one hundred thirty-one thousand, two hundred fifty-six".