1229999999 has 2 divisors, whose sum is σ = 1230000000. Its totient is φ = 1229999998.

The previous prime is 1229999983. The next prime is 1230000047. The reversal of 1229999999 is 9999999221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1229999999 - 2⁴ = 1229999983 is a prime.

It is a Sophie Germain prime.

1229999999 is a modest number, since divided by 99999 gives 12299 as remainder.

It is a plaindrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1229999909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 614999999 + 615000000.

It is an arithmetic number, because the mean of its divisors is an integer number (615000000).

Almost surely, 2^1229999999 is an apocalyptic number.

1229999999 is a deficient number, since it is larger than the sum of its proper divisors (1).

1229999999 is an equidigital number, since it uses as much as digits as its factorization.

1229999999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19131876, while the sum is 68.

The square root of 1229999999 is about 35071.3558192437. The cubic root of 1229999999 is about 1071.4412694004.

The spelling of 1229999999 in words is "one billion, two hundred twenty-nine million, nine hundred ninety-nine thousand, nine hundred ninety-nine".