225256909 has 2 divisors, whose sum is σ = 225256910. Its totient is φ = 225256908.

The previous prime is 225256901. The next prime is 225256961. The reversal of 225256909 is 909652522.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 192515625 + 32741284 = 13875^2 + 5722^2 .

It is a cyclic number.

It is not a de Polignac number, because 225256909 - 2³ = 225256901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (225256901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112628454 + 112628455.

It is an arithmetic number, because the mean of its divisors is an integer number (112628455).

Almost surely, 2^225256909 is an apocalyptic number.

It is an amenable number.

225256909 is a deficient number, since it is larger than the sum of its proper divisors (1).

225256909 is an equidigital number, since it uses as much as digits as its factorization.

225256909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 97200, while the sum is 40.

The square root of 225256909 is about 15008.5611902007. The cubic root of 225256909 is about 608.4516037181.

The spelling of 225256909 in words is "two hundred twenty-five million, two hundred fifty-six thousand, nine hundred nine".