2556481 has 4 divisors (see below), whose sum is σ = 2559700. Its totient is φ = 2553264.

The previous prime is 2556467. The next prime is 2556487. The reversal of 2556481 is 1846552.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1311025 + 1245456 = 1145^2 + 1116^2 .

It is a cyclic number.

It is not a de Polignac number, because 2556481 - 2¹³ = 2548289 is a prime.

It is a super-2 number, since 2×2556481² = 13071190206722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2556487) 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, 535 + ... + 2323.

It is an arithmetic number, because the mean of its divisors is an integer number (639925).

2^2556481 is an apocalyptic number.

It is an amenable number.

2556481 is a deficient number, since it is larger than the sum of its proper divisors (3219).

2556481 is a wasteful number, since it uses less digits than its factorization.

2556481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3218.

The product of its digits is 9600, while the sum is 31.

The square root of 2556481 is about 1598.8999343299. The cubic root of 2556481 is about 136.7353656856.

The spelling of 2556481 in words is "two million, five hundred fifty-six thousand, four hundred eighty-one".