2551656 has 16 divisors (see below), whose sum is σ = 6379200. Its totient is φ = 850544.

The previous prime is 2551651. The next prime is 2551657. The reversal of 2551656 is 6561552.

It is not an unprimeable number, because it can be changed into a prime (2551651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53136 + ... + 53183.

It is an arithmetic number, because the mean of its divisors is an integer number (398700).

2^2551656 is an apocalyptic number.

It is an amenable number.

2551656 is an abundant number, since it is smaller than the sum of its proper divisors (3827544).

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

2551656 is a wasteful number, since it uses less digits than its factorization.

2551656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106328 (or 106324 counting only the distinct ones).

The product of its digits is 9000, while the sum is 30.

The square root of 2551656 is about 1597.3903718252. The cubic root of 2551656 is about 136.6492885564.

It can be divided in two parts, 25 and 51656, that added together give a triangular number (51681 = T₃₂₁).

The spelling of 2551656 in words is "two million, five hundred fifty-one thousand, six hundred fifty-six".