223444381 has 2 divisors, whose sum is σ = 223444382. Its totient is φ = 223444380.

The previous prime is 223444367. The next prime is 223444393. The reversal of 223444381 is 183444322.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 134444025 + 89000356 = 11595^2 + 9434^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-223444381 is a prime.

It is a super-2 number, since 2×223444381² = 99854782800946322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (223444321) 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, 111722190 + 111722191.

It is an arithmetic number, because the mean of its divisors is an integer number (111722191).

Almost surely, 2^223444381 is an apocalyptic number.

It is an amenable number.

223444381 is a deficient number, since it is larger than the sum of its proper divisors (1).

223444381 is an equidigital number, since it uses as much as digits as its factorization.

223444381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18432, while the sum is 31.

The square root of 223444381 is about 14948.0560943555. The cubic root of 223444381 is about 606.8152397790.

The spelling of 223444381 in words is "two hundred twenty-three million, four hundred forty-four thousand, three hundred eighty-one".