2268661 has 4 divisors (see below), whose sum is σ = 2273292. Its totient is φ = 2264032.

The previous prime is 2268659. The next prime is 2268671. The reversal of 2268661 is 1668622.

2268661 is nontrivially palindromic in base 6.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1668622 = 2 ⋅834311.

It can be written as a sum of positive squares in 2 ways, for example, as 220900 + 2047761 = 470^2 + 1431^2 .

It is a cyclic number.

It is not a de Polignac number, because 2268661 - 2¹ = 2268659 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

2268661 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2268631) 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, 1480 + ... + 2593.

It is an arithmetic number, because the mean of its divisors is an integer number (568323).

2^2268661 is an apocalyptic number.

It is an amenable number.

2268661 is a deficient number, since it is larger than the sum of its proper divisors (4631).

2268661 is an equidigital number, since it uses as much as digits as its factorization.

2268661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4630.

The product of its digits is 6912, while the sum is 31.

The square root of 2268661 is about 1506.2074890267. The cubic root of 2268661 is about 131.3983368993.

The spelling of 2268661 in words is "two million, two hundred sixty-eight thousand, six hundred sixty-one".