18105229 has 2 divisors, whose sum is σ = 18105230. Its totient is φ = 18105228.

The previous prime is 18105223. The next prime is 18105257. The reversal of 18105229 is 92250181.

It is an a-pointer prime, because the next prime (18105257) can be obtained adding 18105229 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9753129 + 8352100 = 3123^2 + 2890^2 .

It is an emirp because it is prime and its reverse (92250181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18105229 - 2⁹ = 18104717 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18105197 and 18105206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18105223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9052614 + 9052615.

It is an arithmetic number, because the mean of its divisors is an integer number (9052615).

Almost surely, 2^18105229 is an apocalyptic number.

It is an amenable number.

18105229 is a deficient number, since it is larger than the sum of its proper divisors (1).

18105229 is an equidigital number, since it uses as much as digits as its factorization.

18105229 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 18105229 is about 4255.0239717304. The cubic root of 18105229 is about 262.5838474399.

The spelling of 18105229 in words is "eighteen million, one hundred five thousand, two hundred twenty-nine".