228145187 has 2 divisors, whose sum is σ = 228145188. Its totient is φ = 228145186.

The previous prime is 228145123. The next prime is 228145193. The reversal of 228145187 is 781541822.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 228145187 - 2⁶ = 228145123 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 228145187.

It is not a weakly prime, because it can be changed into another prime (228147187) 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, 114072593 + 114072594.

It is an arithmetic number, because the mean of its divisors is an integer number (114072594).

Almost surely, 2^228145187 is an apocalyptic number.

228145187 is a deficient number, since it is larger than the sum of its proper divisors (1).

228145187 is an equidigital number, since it uses as much as digits as its factorization.

228145187 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 35840, while the sum is 38.

The square root of 228145187 is about 15104.4757274127. The cubic root of 228145187 is about 611.0411200197.

The spelling of 228145187 in words is "two hundred twenty-eight million, one hundred forty-five thousand, one hundred eighty-seven".