228684821 has 2 divisors, whose sum is σ = 228684822. Its totient is φ = 228684820.

The previous prime is 228684811. The next prime is 228684847. The reversal of 228684821 is 128486822.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 205779025 + 22905796 = 14345^2 + 4786^2 .

It is a cyclic number.

It is not a de Polignac number, because 228684821 - 2²² = 224490517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (228684811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114342410 + 114342411.

It is an arithmetic number, because the mean of its divisors is an integer number (114342411).

Almost surely, 2^228684821 is an apocalyptic number.

It is an amenable number.

228684821 is a deficient number, since it is larger than the sum of its proper divisors (1).

228684821 is an equidigital number, since it uses as much as digits as its factorization.

228684821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 98304, while the sum is 41.

The square root of 228684821 is about 15122.3285574676. The cubic root of 228684821 is about 611.5225078167.

The spelling of 228684821 in words is "two hundred twenty-eight million, six hundred eighty-four thousand, eight hundred twenty-one".