228566561 has 4 divisors (see below), whose sum is σ = 240596400. Its totient is φ = 216536724.

The previous prime is 228566557. The next prime is 228566609. The reversal of 228566561 is 165665822.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 228566561 - 2² = 228566557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (228566521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6014891 + ... + 6014928.

It is an arithmetic number, because the mean of its divisors is an integer number (60149100).

Almost surely, 2^228566561 is an apocalyptic number.

It is an amenable number.

228566561 is a deficient number, since it is larger than the sum of its proper divisors (12029839).

228566561 is a wasteful number, since it uses less digits than its factorization.

228566561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12029838.

The product of its digits is 172800, while the sum is 41.

The square root of 228566561 is about 15118.4179397184. The cubic root of 228566561 is about 611.4170772345.

The spelling of 228566561 in words is "two hundred twenty-eight million, five hundred sixty-six thousand, five hundred sixty-one".