999888613 has 2 divisors, whose sum is σ = 999888614. Its totient is φ = 999888612.

The previous prime is 999888581. The next prime is 999888667. The reversal of 999888613 is 316888999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 907093924 + 92794689 = 30118^2 + 9633^2 .

It is a cyclic number.

It is not a de Polignac number, because 999888613 - 2⁵ = 999888581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999888313) 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, 499944306 + 499944307.

It is an arithmetic number, because the mean of its divisors is an integer number (499944307).

Almost surely, 2^999888613 is an apocalyptic number.

It is an amenable number.

999888613 is a deficient number, since it is larger than the sum of its proper divisors (1).

999888613 is an equidigital number, since it uses as much as digits as its factorization.

999888613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6718464, while the sum is 61.

The square root of 999888613 is about 31621.0153695292. The cubic root of 999888613 is about 999.9628696214.

The spelling of 999888613 in words is "nine hundred ninety-nine million, eight hundred eighty-eight thousand, six hundred thirteen".