999381139 has 2 divisors, whose sum is σ = 999381140. Its totient is φ = 999381138.

The previous prime is 999381113. The next prime is 999381157. The reversal of 999381139 is 931183999.

999381139 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 999381139 - 2⁷ = 999381011 is a prime.

It is not a weakly prime, because it can be changed into another prime (999387139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499690569 + 499690570.

It is an arithmetic number, because the mean of its divisors is an integer number (499690570).

Almost surely, 2^999381139 is an apocalyptic number.

999381139 is a deficient number, since it is larger than the sum of its proper divisors (1).

999381139 is an equidigital number, since it uses as much as digits as its factorization.

999381139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 472392, while the sum is 52.

The square root of 999381139 is about 31612.9900357432. The cubic root of 999381139 is about 999.7936704310.

The spelling of 999381139 in words is "nine hundred ninety-nine million, three hundred eighty-one thousand, one hundred thirty-nine".