225655987 has 2 divisors, whose sum is σ = 225655988. Its totient is φ = 225655986.

The previous prime is 225655981. The next prime is 225656063. The reversal of 225655987 is 789556522.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-225655987 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 225655987.

It is not a weakly prime, because it can be changed into another prime (225655981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112827993 + 112827994.

It is an arithmetic number, because the mean of its divisors is an integer number (112827994).

Almost surely, 2^225655987 is an apocalyptic number.

225655987 is a deficient number, since it is larger than the sum of its proper divisors (1).

225655987 is an equidigital number, since it uses as much as digits as its factorization.

225655987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1512000, while the sum is 49.

The square root of 225655987 is about 15021.8503187856. The cubic root of 225655987 is about 608.8107142606.

The spelling of 225655987 in words is "two hundred twenty-five million, six hundred fifty-five thousand, nine hundred eighty-seven".