18609229 has 2 divisors, whose sum is σ = 18609230. Its totient is φ = 18609228.

The previous prime is 18609223. The next prime is 18609247. The reversal of 18609229 is 92290681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18361225 + 248004 = 4285^2 + 498^2 .

It is a cyclic number.

It is not a de Polignac number, because 18609229 - 2⁹ = 18608717 is a prime.

It is a super-3 number, since 3×18609229³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18609223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9304614 + 9304615.

It is an arithmetic number, because the mean of its divisors is an integer number (9304615).

Almost surely, 2^18609229 is an apocalyptic number.

It is an amenable number.

18609229 is a deficient number, since it is larger than the sum of its proper divisors (1).

18609229 is an equidigital number, since it uses as much as digits as its factorization.

18609229 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 18609229 is about 4313.8415594456. The cubic root of 18609229 is about 264.9981203142.

The spelling of 18609229 in words is "eighteen million, six hundred nine thousand, two hundred twenty-nine".