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228181 is a prime number
BaseRepresentation
bin110111101101010101
3102121000011
4313231111
524300211
64520221
71640152
oct675525
9377004
10228181
11146488
12b0071
137cb25
145d229
1547921
hex37b55

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".