2255781 has 16 divisors (see below), whose sum is σ = 3475008. Its totient is φ = 1286400.

The previous prime is 2255767. The next prime is 2255783. The reversal of 2255781 is 1875522.

2255781 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 2255781 - 2⁵ = 2255749 is a prime.

It is a super-2 number, since 2×2255781² = 10177095839922, which contains 22 as substring.

2255781 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2255783) 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, 1450 + ... + 2571.

It is an arithmetic number, because the mean of its divisors is an integer number (217188).

2^2255781 is an apocalyptic number.

It is an amenable number.

2255781 is a deficient number, since it is larger than the sum of its proper divisors (1219227).

2255781 is a wasteful number, since it uses less digits than its factorization.

2255781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4052.

The product of its digits is 5600, while the sum is 30.

The square root of 2255781 is about 1501.9257638112. The cubic root of 2255781 is about 131.1491997025.

It can be divided in two parts, 225 and 5781, that added together give a palindrome (6006).

The spelling of 2255781 in words is "two million, two hundred fifty-five thousand, seven hundred eighty-one".