228181181 has 2 divisors, whose sum is σ = 228181182. Its totient is φ = 228181180.

The previous prime is 228181169. The next prime is 228181189. The reversal of 228181181 is 181181822.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 165533956 + 62647225 = 12866^2 + 7915^2 .

It is a cyclic number.

It is not a de Polignac number, because 228181181 - 2⁶ = 228181117 is a prime.

It is a super-2 number, since 2×228181181² = 104133302725109522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (228181189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114090590 + 114090591.

It is an arithmetic number, because the mean of its divisors is an integer number (114090591).

Almost surely, 2^228181181 is an apocalyptic number.

It is an amenable number.

228181181 is a deficient number, since it is larger than the sum of its proper divisors (1).

228181181 is an equidigital number, since it uses as much as digits as its factorization.

228181181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2048, while the sum is 32.

The square root of 228181181 is about 15105.6671815581. The cubic root of 228181181 is about 611.0732525662.

The spelling of 228181181 in words is "two hundred twenty-eight million, one hundred eighty-one thousand, one hundred eighty-one".