2256005 has 4 divisors (see below), whose sum is σ = 2707212. Its totient is φ = 1804800.

The previous prime is 2255999. The next prime is 2256013. The reversal of 2256005 is 5006522.

It is a happy number.

It is a Cunningham number, because it is equal to 1502²+1.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5006522 = 2 ⋅2503261.

It can be written as a sum of positive squares in 2 ways, for example, as 813604 + 1442401 = 902^2 + 1201^2 .

It is not a de Polignac number, because 2256005 - 2⁴ = 2255989 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 225596 + ... + 225605.

It is an arithmetic number, because the mean of its divisors is an integer number (676803).

2^2256005 is an apocalyptic number.

It is an amenable number.

2256005 is a deficient number, since it is larger than the sum of its proper divisors (451207).

2256005 is an equidigital number, since it uses as much as digits as its factorization.

2256005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 451206.

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 2256005 is about 1502.0003328894. Note that the first 3 decimals coincide. The cubic root of 2256005 is about 131.1535406156.

The spelling of 2256005 in words is "two million, two hundred fifty-six thousand, five".