18165229 has 2 divisors, whose sum is σ = 18165230. Its totient is φ = 18165228.

The previous prime is 18165227. The next prime is 18165233. The reversal of 18165229 is 92256181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12236004 + 5929225 = 3498^2 + 2435^2 .

It is a cyclic number.

It is not a de Polignac number, because 18165229 - 2¹ = 18165227 is a prime.

Together with 18165227, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 18165194 and 18165203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18165227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9082614 + 9082615.

It is an arithmetic number, because the mean of its divisors is an integer number (9082615).

Almost surely, 2^18165229 is an apocalyptic number.

It is an amenable number.

18165229 is a deficient number, since it is larger than the sum of its proper divisors (1).

18165229 is an equidigital number, since it uses as much as digits as its factorization.

18165229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 34.

The square root of 18165229 is about 4262.0686291987. The cubic root of 18165229 is about 262.8735917080.

The spelling of 18165229 in words is "eighteen million, one hundred sixty-five thousand, two hundred twenty-nine".