228688121 has 2 divisors, whose sum is σ = 228688122. Its totient is φ = 228688120.

The previous prime is 228688111. The next prime is 228688127. The reversal of 228688121 is 121886822.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 211382521 + 17305600 = 14539^2 + 4160^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-228688121 is a prime.

It is not a weakly prime, because it can be changed into another prime (228688127) 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, 114344060 + 114344061.

It is an arithmetic number, because the mean of its divisors is an integer number (114344061).

Almost surely, 2^228688121 is an apocalyptic number.

It is an amenable number.

228688121 is a deficient number, since it is larger than the sum of its proper divisors (1).

228688121 is an equidigital number, since it uses as much as digits as its factorization.

228688121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24576, while the sum is 38.

The square root of 228688121 is about 15122.4376672546. The cubic root of 228688121 is about 611.5254492954.

The spelling of 228688121 in words is "two hundred twenty-eight million, six hundred eighty-eight thousand, one hundred twenty-one".