831881 has 2 divisors, whose sum is σ = 831882. Its totient is φ = 831880.

The previous prime is 831863. The next prime is 831889. The reversal of 831881 is 188138.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 512656 + 319225 = 716^2 + 565^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-831881 is a prime.

It is a super-2 number, since 2×831881² = 1384051996322, which contains 22 as substring.

It is a Sophie Germain prime.

It is an Ulam number.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 831881.

It is not a weakly prime, because it can be changed into another prime (831889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 415940 + 415941.

It is an arithmetic number, because the mean of its divisors is an integer number (415941).

2⁸³¹⁸⁸¹ is an apocalyptic number.

It is an amenable number.

831881 is a deficient number, since it is larger than the sum of its proper divisors (1).

831881 is an equidigital number, since it uses as much as digits as its factorization.

831881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1536, while the sum is 29.

The square root of 831881 is about 912.0751065565. The cubic root of 831881 is about 94.0489031792.

The spelling of 831881 in words is "eight hundred thirty-one thousand, eight hundred eighty-one".