2256661 has 4 divisors (see below), whose sum is σ = 2461824. Its totient is φ = 2051500.

The previous prime is 2256637. The next prime is 2256673. The reversal of 2256661 is 1666522.

2256661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 2256661 - 2⁵ = 2256629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2256601) 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 3 ways as a sum of consecutive naturals, for example, 102565 + ... + 102586.

It is an arithmetic number, because the mean of its divisors is an integer number (615456).

2^2256661 is an apocalyptic number.

It is an amenable number.

2256661 is a deficient number, since it is larger than the sum of its proper divisors (205163).

2256661 is a wasteful number, since it uses less digits than its factorization.

2256661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205162.

The product of its digits is 4320, while the sum is 28.

The square root of 2256661 is about 1502.2186924679. The cubic root of 2256661 is about 131.1662516372.

It can be divided in two parts, 225 and 6661, that added together give a palindrome (6886).

The spelling of 2256661 in words is "two million, two hundred fifty-six thousand, six hundred sixty-one".