831139 has 2 divisors, whose sum is σ = 831140. Its totient is φ = 831138.

The previous prime is 831109. The next prime is 831161. The reversal of 831139 is 931138.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 831139 - 2¹⁷ = 700067 is a prime.

It is equal to p₆₆₂₄₇ and since 831139 and 66247 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (831109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 415569 + 415570.

It is an arithmetic number, because the mean of its divisors is an integer number (415570).

2⁸³¹¹³⁹ is an apocalyptic number.

831139 is a deficient number, since it is larger than the sum of its proper divisors (1).

831139 is an equidigital number, since it uses as much as digits as its factorization.

831139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 648, while the sum is 25.

The square root of 831139 is about 911.6682510650. The cubic root of 831139 is about 94.0209324139.

Subtracting 831139 from its reverse (931138), we obtain a palindrome (99999).

The spelling of 831139 in words is "eight hundred thirty-one thousand, one hundred thirty-nine".