999915799 has 2 divisors, whose sum is σ = 999915800. Its totient is φ = 999915798.

The previous prime is 999915781. The next prime is 999915827. The reversal of 999915799 is 997519999.

999915799 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 999915799 - 2⁷ = 999915671 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999915779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499957899 + 499957900.

It is an arithmetic number, because the mean of its divisors is an integer number (499957900).

Almost surely, 2^999915799 is an apocalyptic number.

999915799 is a deficient number, since it is larger than the sum of its proper divisors (1).

999915799 is an equidigital number, since it uses as much as digits as its factorization.

999915799 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18600435, while the sum is 67.

The square root of 999915799 is about 31621.4452389514. The cubic root of 999915799 is about 999.9719322122.

The spelling of 999915799 in words is "nine hundred ninety-nine million, nine hundred fifteen thousand, seven hundred ninety-nine".