225680561 has 8 divisors (see below), whose sum is σ = 228225000. Its totient is φ = 223142400.

The previous prime is 225680551. The next prime is 225680597. The reversal of 225680561 is 165086522.

It can be written as a sum of positive squares in 4 ways, for example, as 141610000 + 84070561 = 11900^2 + 9169^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-225680561 is a prime.

It is a super-2 number, since 2×225680561² = 101863431226549442, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (225680551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 125255 + ... + 127043.

It is an arithmetic number, because the mean of its divisors is an integer number (28528125).

Almost surely, 2^225680561 is an apocalyptic number.

It is an amenable number.

225680561 is a deficient number, since it is larger than the sum of its proper divisors (2544439).

225680561 is a wasteful number, since it uses less digits than its factorization.

225680561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3139.

The product of its (nonzero) digits is 28800, while the sum is 35.

The square root of 225680561 is about 15022.6682383656. The cubic root of 225680561 is about 608.8328133440.

The spelling of 225680561 in words is "two hundred twenty-five million, six hundred eighty thousand, five hundred sixty-one".