999968513 has 2 divisors, whose sum is σ = 999968514. Its totient is φ = 999968512.

The previous prime is 999968477. The next prime is 999968561. The reversal of 999968513 is 315869999.

999968513 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 can be written as a sum of positive squares in only one way, i.e., 973876849 + 26091664 = 31207^2 + 5108^2 .

It is a cyclic number.

It is not a de Polignac number, because 999968513 - 2⁶ = 999968449 is a prime.

It is not a weakly prime, because it can be changed into another prime (999968573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499984256 + 499984257.

It is an arithmetic number, because the mean of its divisors is an integer number (499984257).

Almost surely, 2^999968513 is an apocalyptic number.

It is an amenable number.

999968513 is a deficient number, since it is larger than the sum of its proper divisors (1).

999968513 is an equidigital number, since it uses as much as digits as its factorization.

999968513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4723920, while the sum is 59.

The square root of 999968513 is about 31622.2787445813. The cubic root of 999968513 is about 999.9895042232.

The spelling of 999968513 in words is "nine hundred ninety-nine million, nine hundred sixty-eight thousand, five hundred thirteen".