223422781 has 2 divisors, whose sum is σ = 223422782. Its totient is φ = 223422780.

The previous prime is 223422763. The next prime is 223422791. The reversal of 223422781 is 187224322.

223422781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 186322500 + 37100281 = 13650^2 + 6091^2 .

It is a cyclic number.

It is not a de Polignac number, because 223422781 - 2¹³ = 223414589 is a prime.

It is a super-2 number, since 2×223422781² = 99835478139547922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (223422701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111711390 + 111711391.

It is an arithmetic number, because the mean of its divisors is an integer number (111711391).

Almost surely, 2^223422781 is an apocalyptic number.

It is an amenable number.

223422781 is a deficient number, since it is larger than the sum of its proper divisors (1).

223422781 is an equidigital number, since it uses as much as digits as its factorization.

223422781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10752, while the sum is 31.

The square root of 223422781 is about 14947.3335749223. Note that the first 3 decimals coincide. The cubic root of 223422781 is about 606.7956858726.

The spelling of 223422781 in words is "two hundred twenty-three million, four hundred twenty-two thousand, seven hundred eighty-one".