831398417 has 2 divisors, whose sum is σ = 831398418. Its totient is φ = 831398416.

The previous prime is 831398401. The next prime is 831398423. The reversal of 831398417 is 714893138.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 748788496 + 82609921 = 27364^2 + 9089^2 .

It is a cyclic number.

It is not a de Polignac number, because 831398417 - 2⁴ = 831398401 is a prime.

It is not a weakly prime, because it can be changed into another prime (831398437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 415699208 + 415699209.

It is an arithmetic number, because the mean of its divisors is an integer number (415699209).

Almost surely, 2^831398417 is an apocalyptic number.

It is an amenable number.

831398417 is a deficient number, since it is larger than the sum of its proper divisors (1).

831398417 is an equidigital number, since it uses as much as digits as its factorization.

831398417 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 44.

The square root of 831398417 is about 28833.9802490048. The cubic root of 831398417 is about 940.3071340564.

The spelling of 831398417 in words is "eight hundred thirty-one million, three hundred ninety-eight thousand, four hundred seventeen".