225278987 has 2 divisors, whose sum is σ = 225278988. Its totient is φ = 225278986.

The previous prime is 225278983. The next prime is 225279001. The reversal of 225278987 is 789872522.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 225278987 - 2² = 225278983 is a prime.

It is not a weakly prime, because it can be changed into another prime (225278983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112639493 + 112639494.

It is an arithmetic number, because the mean of its divisors is an integer number (112639494).

Almost surely, 2^225278987 is an apocalyptic number.

225278987 is a deficient number, since it is larger than the sum of its proper divisors (1).

225278987 is an equidigital number, since it uses as much as digits as its factorization.

225278987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1128960, while the sum is 50.

The square root of 225278987 is about 15009.2966857212. The cubic root of 225278987 is about 608.4714816961.

The spelling of 225278987 in words is "two hundred twenty-five million, two hundred seventy-eight thousand, nine hundred eighty-seven".