999139139 has 2 divisors, whose sum is σ = 999139140. Its totient is φ = 999139138.

The previous prime is 999139087. The next prime is 999139151. The reversal of 999139139 is 931931999.

It is a strong prime.

It is an emirp because it is prime and its reverse (931931999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 999139139 - 2²⁴ = 982361923 is a prime.

It is a super-2 number, since 2×999139139² = 1996558038163322642, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (999139039) 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, 499569569 + 499569570.

It is an arithmetic number, because the mean of its divisors is an integer number (499569570).

Almost surely, 2^999139139 is an apocalyptic number.

999139139 is a deficient number, since it is larger than the sum of its proper divisors (1).

999139139 is an equidigital number, since it uses as much as digits as its factorization.

999139139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 531441, while the sum is 53.

The square root of 999139139 is about 31609.1622634957. The cubic root of 999139139 is about 999.7129639515.

The spelling of 999139139 in words is "nine hundred ninety-nine million, one hundred thirty-nine thousand, one hundred thirty-nine".