999999229 has 2 divisors, whose sum is σ = 999999230. Its totient is φ = 999999228.

The previous prime is 999999223. The next prime is 999999323. The reversal of 999999229 is 922999999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 961124004 + 38875225 = 31002^2 + 6235^2 .

It is a cyclic number.

It is not a de Polignac number, because 999999229 - 2⁵ = 999999197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999999223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499999614 + 499999615.

It is an arithmetic number, because the mean of its divisors is an integer number (499999615).

Almost surely, 2^999999229 is an apocalyptic number.

It is an amenable number.

999999229 is a deficient number, since it is larger than the sum of its proper divisors (1).

999999229 is an equidigital number, since it uses as much as digits as its factorization.

999999229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19131876, while the sum is 67.

The square root of 999999229 is about 31622.7644111011. The cubic root of 999999229 is about 999.9997429999. Note that the first 3 decimals are identical.

The spelling of 999999229 in words is "nine hundred ninety-nine million, nine hundred ninety-nine thousand, two hundred twenty-nine".