831161 has 2 divisors, whose sum is σ = 831162. Its totient is φ = 831160.

The previous prime is 831139. The next prime is 831163. The reversal of 831161 is 161138.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 765625 + 65536 = 875^2 + 256^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-831161 is a prime.

Together with 831163, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (831163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 415580 + 415581.

It is an arithmetic number, because the mean of its divisors is an integer number (415581).

2⁸³¹¹⁶¹ is an apocalyptic number.

It is an amenable number.

831161 is a deficient number, since it is larger than the sum of its proper divisors (1).

831161 is an equidigital number, since it uses as much as digits as its factorization.

831161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 144, while the sum is 20.

The square root of 831161 is about 911.6803167778. The cubic root of 831161 is about 94.0217619752.

Adding to 831161 its reverse (161138), we get a palindrome (992299).

The spelling of 831161 in words is "eight hundred thirty-one thousand, one hundred sixty-one".