228111181 has 2 divisors, whose sum is σ = 228111182. Its totient is φ = 228111180.

The previous prime is 228111133. The next prime is 228111197. The reversal of 228111181 is 181111822.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 182007081 + 46104100 = 13491^2 + 6790^2 .

It is a cyclic number.

It is not a de Polignac number, because 228111181 - 2¹³ = 228102989 is a prime.

It is a super-2 number, since 2×228111181² = 104069421794429522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (228111281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114055590 + 114055591.

It is an arithmetic number, because the mean of its divisors is an integer number (114055591).

Almost surely, 2^228111181 is an apocalyptic number.

It is an amenable number.

228111181 is a deficient number, since it is larger than the sum of its proper divisors (1).

228111181 is an equidigital number, since it uses as much as digits as its factorization.

228111181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 256, while the sum is 25.

The square root of 228111181 is about 15103.3499926341. The cubic root of 228111181 is about 611.0107590946.

The spelling of 228111181 in words is "two hundred twenty-eight million, one hundred eleven thousand, one hundred eighty-one".