999309139 has 2 divisors, whose sum is σ = 999309140. Its totient is φ = 999309138.

The previous prime is 999309107. The next prime is 999309187. The reversal of 999309139 is 931903999.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 999309139 - 2⁵ = 999309107 is a prime.

It is not a weakly prime, because it can be changed into another prime (999309539) 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, 499654569 + 499654570.

It is an arithmetic number, because the mean of its divisors is an integer number (499654570).

Almost surely, 2^999309139 is an apocalyptic number.

999309139 is a deficient number, since it is larger than the sum of its proper divisors (1).

999309139 is an equidigital number, since it uses as much as digits as its factorization.

999309139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 531441, while the sum is 52.

The square root of 999309139 is about 31611.8512428488. The cubic root of 999309139 is about 999.7696599475.

The spelling of 999309139 in words is "nine hundred ninety-nine million, three hundred nine thousand, one hundred thirty-nine".