2556851 has 16 divisors (see below), whose sum is σ = 3004128. Its totient is φ = 2168320.

The previous prime is 2556839. The next prime is 2556857. The reversal of 2556851 is 1586552.

2556851 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2556851 - 2¹⁸ = 2294707 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (2556857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22571 + ... + 22683.

It is an arithmetic number, because the mean of its divisors is an integer number (187758).

2^2556851 is an apocalyptic number.

2556851 is a deficient number, since it is larger than the sum of its proper divisors (447277).

2556851 is a wasteful number, since it uses less digits than its factorization.

2556851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163 (or 141 counting only the distinct ones).

The product of its digits is 12000, while the sum is 32.

The square root of 2556851 is about 1599.0156346953. The cubic root of 2556851 is about 136.7419619462.

Subtracting from 2556851 its reverse (1586552), we obtain a cube (970299 = 99³).

The spelling of 2556851 in words is "two million, five hundred fifty-six thousand, eight hundred fifty-one".