225043561 has 2 divisors, whose sum is σ = 225043562. Its totient is φ = 225043560.

The previous prime is 225043537. The next prime is 225043573. The reversal of 225043561 is 165340522.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 200392336 + 24651225 = 14156^2 + 4965^2 .

It is a cyclic number.

It is not a de Polignac number, because 225043561 - 2¹¹ = 225041513 is a prime.

It is not a weakly prime, because it can be changed into another prime (225043591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112521780 + 112521781.

It is an arithmetic number, because the mean of its divisors is an integer number (112521781).

Almost surely, 2^225043561 is an apocalyptic number.

It is an amenable number.

225043561 is a deficient number, since it is larger than the sum of its proper divisors (1).

225043561 is an equidigital number, since it uses as much as digits as its factorization.

225043561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 225043561 is about 15001.4519630601. The cubic root of 225043561 is about 608.2594484025.

The spelling of 225043561 in words is "two hundred twenty-five million, forty-three thousand, five hundred sixty-one".