223089781 has 4 divisors (see below), whose sum is σ = 223303500. Its totient is φ = 222876064.

The previous prime is 223089751. The next prime is 223089791. The reversal of 223089781 is 187980322.

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

It can be written as a sum of positive squares in 2 ways, for example, as 131102500 + 91987281 = 11450^2 + 9591^2 .

It is a cyclic number.

It is not a de Polignac number, because 223089781 - 2¹⁹ = 222565493 is a prime.

It is a super-3 number, since 3×223089781³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Smith number, since the sum of its digits (40) 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.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (223089731) 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, 105286 + ... + 107383.

It is an arithmetic number, because the mean of its divisors is an integer number (55825875).

Almost surely, 2^223089781 is an apocalyptic number.

It is an amenable number.

223089781 is a deficient number, since it is larger than the sum of its proper divisors (213719).

223089781 is a wasteful number, since it uses less digits than its factorization.

223089781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213718.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 223089781 is about 14936.1903107854. The cubic root of 223089781 is about 606.4940702036.

It can be divided in two parts, 22 and 3089781, that added together give a palindrome (3089803).

The spelling of 223089781 in words is "two hundred twenty-three million, eighty-nine thousand, seven hundred eighty-one".