223604981 has 2 divisors, whose sum is σ = 223604982. Its totient is φ = 223604980.

The previous prime is 223604971. The next prime is 223605007. The reversal of 223604981 is 189406322.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 196252081 + 27352900 = 14009^2 + 5230^2 .

It is a cyclic number.

It is not a de Polignac number, because 223604981 - 2⁶ = 223604917 is a prime.

It is a super-2 number, since 2×223604981² = 99998375056020722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (223604971) 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, 111802490 + 111802491.

It is an arithmetic number, because the mean of its divisors is an integer number (111802491).

Almost surely, 2^223604981 is an apocalyptic number.

It is an amenable number.

223604981 is a deficient number, since it is larger than the sum of its proper divisors (1).

223604981 is an equidigital number, since it uses as much as digits as its factorization.

223604981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 223604981 is about 14953.4270653921. The cubic root of 223604981 is about 606.9605871924.

The spelling of 223604981 in words is "two hundred twenty-three million, six hundred four thousand, nine hundred eighty-one".