228128429 has 2 divisors, whose sum is σ = 228128430. Its totient is φ = 228128428.

The previous prime is 228128419. The next prime is 228128437. The reversal of 228128429 is 924821822.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 216384100 + 11744329 = 14710^2 + 3427^2 .

It is a cyclic number.

It is not a de Polignac number, because 228128429 - 2¹⁶ = 228062893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 228128392 and 228128401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (228128419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114064214 + 114064215.

It is an arithmetic number, because the mean of its divisors is an integer number (114064215).

Almost surely, 2^228128429 is an apocalyptic number.

It is an amenable number.

228128429 is a deficient number, since it is larger than the sum of its proper divisors (1).

228128429 is an equidigital number, since it uses as much as digits as its factorization.

228128429 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36864, while the sum is 38.

The square root of 228128429 is about 15103.9209809903. The cubic root of 228128429 is about 611.0261586728.

The spelling of 228128429 in words is "two hundred twenty-eight million, one hundred twenty-eight thousand, four hundred twenty-nine".