223109981 has 2 divisors, whose sum is σ = 223109982. Its totient is φ = 223109980.

The previous prime is 223109947. The next prime is 223109993. The reversal of 223109981 is 189901322.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 157904356 + 65205625 = 12566^2 + 8075^2 .

It is a cyclic number.

It is not a de Polignac number, because 223109981 - 2¹⁴ = 223093597 is a prime.

It is a super-3 number, since 3×223109981³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (223109281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111554990 + 111554991.

It is an arithmetic number, because the mean of its divisors is an integer number (111554991).

Almost surely, 2^223109981 is an apocalyptic number.

It is an amenable number.

223109981 is a deficient number, since it is larger than the sum of its proper divisors (1).

223109981 is an equidigital number, since it uses as much as digits as its factorization.

223109981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 223109981 is about 14936.8665053953. The cubic root of 223109981 is about 606.5123749573.

The spelling of 223109981 in words is "two hundred twenty-three million, one hundred nine thousand, nine hundred eighty-one".