225665749 has 2 divisors, whose sum is σ = 225665750. Its totient is φ = 225665748.

The previous prime is 225665729. The next prime is 225665767. The reversal of 225665749 is 947566522.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 140896900 + 84768849 = 11870^2 + 9207^2 .

It is a cyclic number.

It is not a de Polignac number, because 225665749 - 2⁷ = 225665621 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 225665699 and 225665708.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (225665729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112832874 + 112832875.

It is an arithmetic number, because the mean of its divisors is an integer number (112832875).

Almost surely, 2^225665749 is an apocalyptic number.

It is an amenable number.

225665749 is a deficient number, since it is larger than the sum of its proper divisors (1).

225665749 is an equidigital number, since it uses as much as digits as its factorization.

225665749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 907200, while the sum is 46.

The square root of 225665749 is about 15022.1752419548. The cubic root of 225665749 is about 608.8194932942.

The spelling of 225665749 in words is "two hundred twenty-five million, six hundred sixty-five thousand, seven hundred forty-nine".