225665287 has 2 divisors, whose sum is σ = 225665288. Its totient is φ = 225665286.

The previous prime is 225665243. The next prime is 225665339. The reversal of 225665287 is 782566522.

225665287 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-225665287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (225665227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112832643 + 112832644.

It is an arithmetic number, because the mean of its divisors is an integer number (112832644).

Almost surely, 2^225665287 is an apocalyptic number.

225665287 is a deficient number, since it is larger than the sum of its proper divisors (1).

225665287 is an equidigital number, since it uses as much as digits as its factorization.

225665287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 403200, while the sum is 43.

The square root of 225665287 is about 15022.1598646799. The cubic root of 225665287 is about 608.8190778201.

The spelling of 225665287 in words is "two hundred twenty-five million, six hundred sixty-five thousand, two hundred eighty-seven".