18502229 has 2 divisors, whose sum is σ = 18502230. Its totient is φ = 18502228.

The previous prime is 18502213. The next prime is 18502241. The reversal of 18502229 is 92220581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10080625 + 8421604 = 3175^2 + 2902^2 .

It is an emirp because it is prime and its reverse (92220581) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18502229 - 2⁴ = 18502213 is a prime.

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 (18502279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9251114 + 9251115.

It is an arithmetic number, because the mean of its divisors is an integer number (9251115).

Almost surely, 2^18502229 is an apocalyptic number.

It is an amenable number.

18502229 is a deficient number, since it is larger than the sum of its proper divisors (1).

18502229 is an equidigital number, since it uses as much as digits as its factorization.

18502229 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 18502229 is about 4301.4217417035. The cubic root of 18502229 is about 264.4892452415.

The spelling of 18502229 in words is "eighteen million, five hundred two thousand, two hundred twenty-nine".