228181 has 2 divisors, whose sum is σ = 228182. Its totient is φ = 228180.
The previous prime is 228139. The next prime is 228197. The reversal of 228181 is 181822.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 217156 + 11025 = 466^2 + 105^2 .
It is a cyclic number.
It is not a de Polignac number, because 228181 - 211 = 226133 is a prime.
It is a super-2 number, since 2×2281812 = 104133137522, which contains 22 as substring.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (228131) by changing a digit.
It is a good prime.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114090 + 114091.
It is an arithmetic number, because the mean of its divisors is an integer number (114091).
2228181 is an apocalyptic number.
It is an amenable number.
228181 is a deficient number, since it is larger than the sum of its proper divisors (1).
228181 is an equidigital number, since it uses as much as digits as its factorization.
228181 is an evil number, because the sum of its binary digits is even.
The product of its digits is 256, while the sum is 22.
The square root of 228181 is about 477.6829492456. The cubic root of 228181 is about 61.1073090992.
The spelling of 228181 in words is "two hundred twenty-eight thousand, one hundred eighty-one".
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