223225781 has 2 divisors, whose sum is σ = 223225782. Its totient is φ = 223225780.

The previous prime is 223225757. The next prime is 223225801. The reversal of 223225781 is 187522322.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 218773681 + 4452100 = 14791^2 + 2110^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-223225781 is a prime.

It is a super-3 number, since 3×223225781³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220225781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111612890 + 111612891.

It is an arithmetic number, because the mean of its divisors is an integer number (111612891).

Almost surely, 2^223225781 is an apocalyptic number.

It is an amenable number.

223225781 is a deficient number, since it is larger than the sum of its proper divisors (1).

223225781 is an equidigital number, since it uses as much as digits as its factorization.

223225781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13440, while the sum is 32.

The square root of 223225781 is about 14940.7423175691. The cubic root of 223225781 is about 606.6172888135.

The spelling of 223225781 in words is "two hundred twenty-three million, two hundred twenty-five thousand, seven hundred eighty-one".