228556861 has 4 divisors (see below), whose sum is σ = 246138172. Its totient is φ = 210975552.

The previous prime is 228556849. The next prime is 228556877. The reversal of 228556861 is 168655822.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 30591961 + 197964900 = 5531^2 + 14070^2 .

It is a cyclic number.

It is not a de Polignac number, because 228556861 - 2¹³ = 228548669 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228556961) 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, 8790636 + ... + 8790661.

It is an arithmetic number, because the mean of its divisors is an integer number (61534543).

Almost surely, 2^228556861 is an apocalyptic number.

It is an amenable number.

228556861 is a deficient number, since it is larger than the sum of its proper divisors (17581311).

228556861 is a wasteful number, since it uses less digits than its factorization.

228556861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17581310.

The product of its digits is 230400, while the sum is 43.

The square root of 228556861 is about 15118.0971355525. The cubic root of 228556861 is about 611.4084279239.

The spelling of 228556861 in words is "two hundred twenty-eight million, five hundred fifty-six thousand, eight hundred sixty-one".