228307181 has 2 divisors, whose sum is σ = 228307182. Its totient is φ = 228307180.

The previous prime is 228307171. The next prime is 228307213. The reversal of 228307181 is 181703822.

It is an a-pointer prime, because the next prime (228307213) can be obtained adding 228307181 to its sum of digits (32).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 227557225 + 749956 = 15085^2 + 866^2 .

It is a cyclic number.

It is not a de Polignac number, because 228307181 - 2⁶ = 228307117 is a prime.

It is a super-2 number, since 2×228307181² = 104248337792333522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (228307151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114153590 + 114153591.

It is an arithmetic number, because the mean of its divisors is an integer number (114153591).

Almost surely, 2^228307181 is an apocalyptic number.

It is an amenable number.

228307181 is a deficient number, since it is larger than the sum of its proper divisors (1).

228307181 is an equidigital number, since it uses as much as digits as its factorization.

228307181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5376, while the sum is 32.

The square root of 228307181 is about 15109.8372261252. The cubic root of 228307181 is about 611.1857086151.

The spelling of 228307181 in words is "two hundred twenty-eight million, three hundred seven thousand, one hundred eighty-one".