228664081 has 2 divisors, whose sum is σ = 228664082. Its totient is φ = 228664080.

The previous prime is 228664049. The next prime is 228664123. The reversal of 228664081 is 180466822.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 198359056 + 30305025 = 14084^2 + 5505^2 .

It is a cyclic number.

It is not a de Polignac number, because 228664081 - 2⁵ = 228664049 is a prime.

It is a super-2 number, since 2×228664081² = 104574523879149122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 228664081.

It is not a weakly prime, because it can be changed into another prime (228664001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114332040 + 114332041.

It is an arithmetic number, because the mean of its divisors is an integer number (114332041).

Almost surely, 2^228664081 is an apocalyptic number.

It is an amenable number.

228664081 is a deficient number, since it is larger than the sum of its proper divisors (1).

228664081 is an equidigital number, since it uses as much as digits as its factorization.

228664081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36864, while the sum is 37.

The square root of 228664081 is about 15121.6428009658. The cubic root of 228664081 is about 611.5040204211.

The spelling of 228664081 in words is "two hundred twenty-eight million, six hundred sixty-four thousand, eighty-one".