2230781 has 4 divisors (see below), whose sum is σ = 2549472. Its totient is φ = 1912092.

The previous prime is 2230777. The next prime is 2230783. The reversal of 2230781 is 1870322.

2230781 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 2230781 - 2² = 2230777 is a prime.

It is a super-3 number, since 3×2230781³ = 33303667757446408623, which contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a d-powerful number, because it can be written as 2⁷ + 2¹⁷ + 3³ + 0 + 7⁴ + 8⁷ + 1 .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2230783) 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, 159335 + ... + 159348.

It is an arithmetic number, because the mean of its divisors is an integer number (637368).

2^2230781 is an apocalyptic number.

It is an amenable number.

2230781 is a deficient number, since it is larger than the sum of its proper divisors (318691).

2230781 is an equidigital number, since it uses as much as digits as its factorization.

2230781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318690.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 2230781 is about 1493.5799275566. The cubic root of 2230781 is about 130.6629058279.

It can be divided in two parts, 22 and 30781, that added together give a palindrome (30803).

The spelling of 2230781 in words is "two million, two hundred thirty thousand, seven hundred eighty-one".