999728519 has 2 divisors, whose sum is σ = 999728520. Its totient is φ = 999728518.

The previous prime is 999728497. The next prime is 999728531. The reversal of 999728519 is 915827999.

It is a strong prime.

It is an emirp because it is prime and its reverse (915827999) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999728519 is a prime.

It is a super-2 number, since 2×999728519² = 1998914223403866722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999728539) 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, 499864259 + 499864260.

It is an arithmetic number, because the mean of its divisors is an integer number (499864260).

Almost surely, 2^999728519 is an apocalyptic number.

999728519 is a deficient number, since it is larger than the sum of its proper divisors (1).

999728519 is an equidigital number, since it uses as much as digits as its factorization.

999728519 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3674160, while the sum is 59.

The square root of 999728519 is about 31618.4838188045. The cubic root of 999728519 is about 999.9094981430.

The spelling of 999728519 in words is "nine hundred ninety-nine million, seven hundred twenty-eight thousand, five hundred nineteen".