2131256 has 16 divisors (see below), whose sum is σ = 4231440. Its totient is φ = 1002880.

The previous prime is 2131253. The next prime is 2131267. The reversal of 2131256 is 6521312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2131253) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 7700 + ... + 7971.

It is an arithmetic number, because the mean of its divisors is an integer number (264465).

2^2131256 is an apocalyptic number.

It is an amenable number.

2131256 is a deficient number, since it is larger than the sum of its proper divisors (2100184).

2131256 is a wasteful number, since it uses less digits than its factorization.

2131256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15694 (or 15690 counting only the distinct ones).

The product of its digits is 360, while the sum is 20.

The square root of 2131256 is about 1459.8821870274. The cubic root of 2131256 is about 128.6901201426.

Adding to 2131256 its reverse (6521312), we get a palindrome (8652568).

The spelling of 2131256 in words is "two million, one hundred thirty-one thousand, two hundred fifty-six".