225143561 has 2 divisors, whose sum is σ = 225143562. Its totient is φ = 225143560.

The previous prime is 225143551. The next prime is 225143579. The reversal of 225143561 is 165341522.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 131905225 + 93238336 = 11485^2 + 9656^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-225143561 is a prime.

It is a Chen prime.

It is equal to p_12390338 and since 225143561 and 12390338 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (225143551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112571780 + 112571781.

It is an arithmetic number, because the mean of its divisors is an integer number (112571781).

Almost surely, 2^225143561 is an apocalyptic number.

It is an amenable number.

225143561 is a deficient number, since it is larger than the sum of its proper divisors (1).

225143561 is an equidigital number, since it uses as much as digits as its factorization.

225143561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7200, while the sum is 29.

The square root of 225143561 is about 15004.7846035856. The cubic root of 225143561 is about 608.3495301290.

The spelling of 225143561 in words is "two hundred twenty-five million, one hundred forty-three thousand, five hundred sixty-one".