2256817 has 4 divisors (see below), whose sum is σ = 2293876. Its totient is φ = 2219760.

The previous prime is 2256811. The next prime is 2256823. The reversal of 2256817 is 7186522.

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

It is an interprime number because it is at equal distance from previous prime (2256811) and next prime (2256823).

It can be written as a sum of positive squares in 2 ways, for example, as 758641 + 1498176 = 871^2 + 1224^2 .

It is a cyclic number.

It is not a de Polignac number, because 2256817 - 2⁷ = 2256689 is a prime.

It is a d-powerful number, because it can be written as 2¹⁴ + 2¹⁹ + 5⁶ + 6⁸ + 8⁴ + 1 + 7⁵ .

It is a Duffinian number.

2256817 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2256811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18438 + ... + 18559.

It is an arithmetic number, because the mean of its divisors is an integer number (573469).

2^2256817 is an apocalyptic number.

It is an amenable number.

2256817 is a deficient number, since it is larger than the sum of its proper divisors (37059).

2256817 is an equidigital number, since it uses as much as digits as its factorization.

2256817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37058.

The product of its digits is 6720, while the sum is 31.

The square root of 2256817 is about 1502.2706147695. The cubic root of 2256817 is about 131.1692740176.

The spelling of 2256817 in words is "two million, two hundred fifty-six thousand, eight hundred seventeen".