831395993 has 2 divisors, whose sum is σ = 831395994. Its totient is φ = 831395992.

The previous prime is 831395953. The next prime is 831396017. The reversal of 831395993 is 399593138.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 432515209 + 398880784 = 20797^2 + 19972^2 .

It is a cyclic number.

It is not a de Polignac number, because 831395993 - 2¹⁴ = 831379609 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (831395923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 415697996 + 415697997.

It is an arithmetic number, because the mean of its divisors is an integer number (415697997).

Almost surely, 2^831395993 is an apocalyptic number.

It is an amenable number.

831395993 is a deficient number, since it is larger than the sum of its proper divisors (1).

831395993 is an equidigital number, since it uses as much as digits as its factorization.

831395993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 787320, while the sum is 50.

The square root of 831395993 is about 28833.9382152352. The cubic root of 831395993 is about 940.3062202119.

The spelling of 831395993 in words is "eight hundred thirty-one million, three hundred ninety-five thousand, nine hundred ninety-three".