831091 has 2 divisors, whose sum is σ = 831092. Its totient is φ = 831090.

The previous prime is 831073. The next prime is 831109. The reversal of 831091 is 190138.

Together with next prime (831109) it forms an Ormiston pair, because they use the same digits, order apart.

It is a balanced prime because it is at equal distance from previous prime (831073) and next prime (831109).

It is a cyclic number.

It is not a de Polignac number, because 831091 - 2⁹ = 830579 is a prime.

It is not a weakly prime, because it can be changed into another prime (831031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 415545 + 415546.

It is an arithmetic number, because the mean of its divisors is an integer number (415546).

2⁸³¹⁰⁹¹ is an apocalyptic number.

831091 is a deficient number, since it is larger than the sum of its proper divisors (1).

831091 is an equidigital number, since it uses as much as digits as its factorization.

831091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 22.

The square root of 831091 is about 911.6419253194. The cubic root of 831091 is about 94.0191224112.

The spelling of 831091 in words is "eight hundred thirty-one thousand, ninety-one".