1223219999 has 2 divisors, whose sum is σ = 1223220000. Its totient is φ = 1223219998.

The previous prime is 1223219983. The next prime is 1223220043. The reversal of 1223219999 is 9999123221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1223219999 - 2⁴ = 1223219983 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1223219929) 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, 611609999 + 611610000.

It is an arithmetic number, because the mean of its divisors is an integer number (611610000).

Almost surely, 2^1223219999 is an apocalyptic number.

1223219999 is a deficient number, since it is larger than the sum of its proper divisors (1).

1223219999 is an equidigital number, since it uses as much as digits as its factorization.

1223219999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 157464, while the sum is 47.

The square root of 1223219999 is about 34974.5621702402. The cubic root of 1223219999 is about 1069.4689766137.

The spelling of 1223219999 in words is "one billion, two hundred twenty-three million, two hundred nineteen thousand, nine hundred ninety-nine".