831831397 has 2 divisors, whose sum is σ = 831831398. Its totient is φ = 831831396.

The previous prime is 831831349. The next prime is 831831443. The reversal of 831831397 is 793138138.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 643839876 + 187991521 = 25374^2 + 13711^2 .

It is a cyclic number.

It is not a de Polignac number, because 831831397 - 2²⁷ = 697613669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (831831337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 415915698 + 415915699.

It is an arithmetic number, because the mean of its divisors is an integer number (415915699).

Almost surely, 2^831831397 is an apocalyptic number.

It is an amenable number.

831831397 is a deficient number, since it is larger than the sum of its proper divisors (1).

831831397 is an equidigital number, since it uses as much as digits as its factorization.

831831397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 43.

The square root of 831831397 is about 28841.4874269688. The cubic root of 831831397 is about 940.4703384113.

The spelling of 831831397 in words is "eight hundred thirty-one million, eight hundred thirty-one thousand, three hundred ninety-seven".