2256591 has 4 divisors (see below), whose sum is σ = 3008792. Its totient is φ = 1504392.

The previous prime is 2256571. The next prime is 2256601. The reversal of 2256591 is 1956522.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 2256591 - 2⁵ = 2256559 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2256571) 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, 376096 + ... + 376101.

It is an arithmetic number, because the mean of its divisors is an integer number (752198).

2^2256591 is an apocalyptic number.

2256591 is a deficient number, since it is larger than the sum of its proper divisors (752201).

2256591 is an equidigital number, since it uses as much as digits as its factorization.

2256591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 752200.

The product of its digits is 5400, while the sum is 30.

The square root of 2256591 is about 1502.1953934159. The cubic root of 2256591 is about 131.1648953956.

The spelling of 2256591 in words is "two million, two hundred fifty-six thousand, five hundred ninety-one".