225565871 has 2 divisors, whose sum is σ = 225565872. Its totient is φ = 225565870.

The previous prime is 225565867. The next prime is 225565897. The reversal of 225565871 is 178565522.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 225565871 - 2² = 225565867 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (225565811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112782935 + 112782936.

It is an arithmetic number, because the mean of its divisors is an integer number (112782936).

Almost surely, 2^225565871 is an apocalyptic number.

225565871 is a deficient number, since it is larger than the sum of its proper divisors (1).

225565871 is an equidigital number, since it uses as much as digits as its factorization.

225565871 is an evil number, because the sum of its binary digits is even.

The product of its digits is 168000, while the sum is 41.

The square root of 225565871 is about 15018.8505219274. The cubic root of 225565871 is about 608.7296603638.

The spelling of 225565871 in words is "two hundred twenty-five million, five hundred sixty-five thousand, eight hundred seventy-one".