2131656 has 16 divisors (see below), whose sum is σ = 5329200. Its totient is φ = 710544.

The previous prime is 2131651. The next prime is 2131669. The reversal of 2131656 is 6561312.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 88819 = 2131656 / (2 + 1 + 3 + 1 + 6 + 5 + 6).

It is not an unprimeable number, because it can be changed into a prime (2131651) 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, 44386 + ... + 44433.

It is an arithmetic number, because the mean of its divisors is an integer number (333075).

2^2131656 is an apocalyptic number.

It is an amenable number.

2131656 is an abundant number, since it is smaller than the sum of its proper divisors (3197544).

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

2131656 is a wasteful number, since it uses less digits than its factorization.

2131656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88828 (or 88824 counting only the distinct ones).

The product of its digits is 1080, while the sum is 24.

The square root of 2131656 is about 1460.0191779562. The cubic root of 2131656 is about 128.6981706111.

Adding to 2131656 its reverse (6561312), we get a palindrome (8692968).

The spelling of 2131656 in words is "two million, one hundred thirty-one thousand, six hundred fifty-six".