999831139 has 2 divisors, whose sum is σ = 999831140. Its totient is φ = 999831138.

The previous prime is 999831103. The next prime is 999831163. The reversal of 999831139 is 931138999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 999831139 - 2⁷ = 999831011 is a prime.

It is not a weakly prime, because it can be changed into another prime (999831739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499915569 + 499915570.

It is an arithmetic number, because the mean of its divisors is an integer number (499915570).

Almost surely, 2^999831139 is an apocalyptic number.

999831139 is a deficient number, since it is larger than the sum of its proper divisors (1).

999831139 is an equidigital number, since it uses as much as digits as its factorization.

999831139 is an evil number, because the sum of its binary digits is even.

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

The square root of 999831139 is about 31620.1065621228. The cubic root of 999831139 is about 999.9437098315.

The spelling of 999831139 in words is "nine hundred ninety-nine million, eight hundred thirty-one thousand, one hundred thirty-nine".