225891569 has 2 divisors, whose sum is σ = 225891570. Its totient is φ = 225891568.

The previous prime is 225891539. The next prime is 225891577. The reversal of 225891569 is 965198522.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 214915600 + 10975969 = 14660^2 + 3313^2 .

It is a cyclic number.

It is not a de Polignac number, because 225891569 - 2⁸ = 225891313 is a prime.

It is a super-2 number, since 2×225891569² = 102054001890563522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (225891539) 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, 112945784 + 112945785.

It is an arithmetic number, because the mean of its divisors is an integer number (112945785).

Almost surely, 2^225891569 is an apocalyptic number.

It is an amenable number.

225891569 is a deficient number, since it is larger than the sum of its proper divisors (1).

225891569 is an equidigital number, since it uses as much as digits as its factorization.

225891569 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 388800, while the sum is 47.

The square root of 225891569 is about 15029.6895842862. The cubic root of 225891569 is about 609.0225041408.

The spelling of 225891569 in words is "two hundred twenty-five million, eight hundred ninety-one thousand, five hundred sixty-nine".