223745981 has 2 divisors, whose sum is σ = 223745982. Its totient is φ = 223745980.

The previous prime is 223745903. The next prime is 223746011. The reversal of 223745981 is 189547322.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 208340356 + 15405625 = 14434^2 + 3925^2 .

It is a cyclic number.

It is not a de Polignac number, because 223745981 - 2¹⁸ = 223483837 is a prime.

It is a super-2 number, since 2×223745981² = 100124528027304722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (223795981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111872990 + 111872991.

It is an arithmetic number, because the mean of its divisors is an integer number (111872991).

Almost surely, 2^223745981 is an apocalyptic number.

It is an amenable number.

223745981 is a deficient number, since it is larger than the sum of its proper divisors (1).

223745981 is an equidigital number, since it uses as much as digits as its factorization.

223745981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120960, while the sum is 41.

The square root of 223745981 is about 14958.1409606943. The cubic root of 223745981 is about 607.0881387049.

The spelling of 223745981 in words is "two hundred twenty-three million, seven hundred forty-five thousand, nine hundred eighty-one".