225724561 has 2 divisors, whose sum is σ = 225724562. Its totient is φ = 225724560.

The previous prime is 225724537. The next prime is 225724571. The reversal of 225724561 is 165427522.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 146870161 + 78854400 = 12119^2 + 8880^2 .

It is a cyclic number.

It is not a de Polignac number, because 225724561 - 2²¹ = 223627409 is a prime.

It is not a weakly prime, because it can be changed into another prime (225724571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112862280 + 112862281.

It is an arithmetic number, because the mean of its divisors is an integer number (112862281).

Almost surely, 2^225724561 is an apocalyptic number.

It is an amenable number.

225724561 is a deficient number, since it is larger than the sum of its proper divisors (1).

225724561 is an equidigital number, since it uses as much as digits as its factorization.

225724561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 33600, while the sum is 34.

The square root of 225724561 is about 15024.1326205542. The cubic root of 225724561 is about 608.8723779730.

The spelling of 225724561 in words is "two hundred twenty-five million, seven hundred twenty-four thousand, five hundred sixty-one".