225705561 has 8 divisors (see below), whose sum is σ = 305063520. Its totient is φ = 148408992.

The previous prime is 225705511. The next prime is 225705569. The reversal of 225705561 is 165507522.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 225705561 - 2²⁷ = 91487833 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (225705569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 515091 + ... + 515528.

It is an arithmetic number, because the mean of its divisors is an integer number (38132940).

Almost surely, 2^225705561 is an apocalyptic number.

It is an amenable number.

225705561 is a deficient number, since it is larger than the sum of its proper divisors (79357959).

225705561 is a wasteful number, since it uses less digits than its factorization.

225705561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1030695.

The product of its (nonzero) digits is 21000, while the sum is 33.

The square root of 225705561 is about 15023.5002912104. The cubic root of 225705561 is about 608.8552938776.

The spelling of 225705561 in words is "two hundred twenty-five million, seven hundred five thousand, five hundred sixty-one".